- The hero of the story. Two versions of this character appear in the series; the one we first meet is a clone (now simply called "The Clone") created by Fei Wong Reed, while the original was kept imprisoned. They share basic character traits. Syaoran is a crossover character from Cardcaptor Sakura.
- Original Syaoran: "Tsubasa Li": Kept asleep in a liquid chamber at Fei Wong Reed's palace, with his left eye covered by a piece of cloth, his hands and arms by binding spells and wearing clothes marking Fei Wong Reed's bat symbol. In fact, this "Syaoran" is the original while the Syaoran at Sakura's side is only a clone that Fei Wong Reed created. Tsubasa is of Clow Reed's bloodline and can thus use magic. He gave his eye and with it half of his heart to his clone to stop Fei Wong's plan temporarily, he also hoped that this action could create a true heart in the clone. Because he had given his eye Tsubasa was able to witness all the events the clone did. He was depicted as a villain (it was believed that he was controlling the clone's actions, while it was only the clone's true nature showing) until it was discovered that the protagonist Syaoran is his clone. Now Tsubasa is the story's protagonist. Tsubasa is able to summon a sword which looks exactly like the one used by Syaoran Li from Cardcaptor Sakura and also uses the same spells. He is NOT the son of Sakura Kinomoto and Syaoran Li, although this is at first heavily implied; his parents were the clone Sakura and Syaoran, which were granted the wish of a second chance at life by Yūko (as explained in Chapters 220 and 221). With their disappearance, Tsubasa's existence has become paradox.
- Clone Syaoran: "The Clone": He is an excellent martial artist and an aspiring archaeologist with extensive knowledge of various languages, histories, and artifacts. His right eye is blind; sometimes, in mysterious dreams, he can see out of the eye and look at a person he recognizes as himself in endless mirrors (see above). Syaoran was found in his childhood wandering the streets without a memory, before he was discovered and adopted by Fujitaka (Sakura's father in Cardcaptor Sakura), who recently passed away, leaving his foster son to continue his great work. He obtained his sword Hien during his stay at Ōto, which he learned to use from Kurogane, and learned his fighting abilities from now-enemy Seishirō, who can also travel between worlds and says he is looking for vampires. As a clone, he has no mind or consciousness and exists only to collect all of Sakura's feathers and to return them to her. Of all the clones created by Fei Wong Reed, he is the closest to what Fei Wong Reed intended. Although he has no magic of his own, he does, however, possess the ability to store and use magic. After the real Syaoran was released and arrived in Tokyo to face him the clone gouged out one of Fay's eyes in order to absorb his magical power.
- The Princess of Clow Country. Sakura is a cheerful, selfless, and stronghearted being. She states if there was ever something that she could do, she would try her absolute best. She possesses a mysterious power, namely her "wings" that can actually change the world, though it will still be a while before anyone understands what that means. Her wings are the manifestation of her soul, namely her heart and memories. She is targeted by Fei Wong for that very power. After losing her memories, Syaoran gave up their relationship in order to save her. Meaning, even if she regains all of her memories, the one that she would never retrieve would be the knowledge of Syaoran's existence. She is unusually excellent at games of chance, whether it's her mysterious power or, as Chu'Nyan mentioned in the Country of Koryo, extremely lucky from being "a favorite of the gods," meaning she gets such good fortune from being one of the gods' favorite daughter. Her main goal is to find the clone of Syaoran, who has now separated from the group. Later in the series, Sakura makes a deal with Yuuko which leads to the inability to use her right leg and the loss of her status as 'a favorite of gods.' Her soul was in the Dream World, where she communicated with Watanuki Kimihiro regularly. Her body remains with her traveling companions as her soul was lost in a battle between the Syaorans. Eventually, in chapter 178, it is found out that the Sakura who was traveling, is in fact a clone of both the original body and soul created by Fei Wang Reed in order for her "body" to be the body which creates memories of the worlds visited. The real Sakura's soul was seen at the end of chapter 178 [in a flashback], it was released into the tube (this tube looks identical to the tube in the first pages of Tsubasa). Sakura is a crossover character from Cardcaptor Sakura.
- A rough-mannered ninja from the world of Nihon (Japan), exiled for his recklessness. He originally possessed the replica of Ginryū, a sword, before giving it to Yūko as price for his deal with her. He obtained a new sword in Ōto called the Sōhi, and taught Syaoran the skills of sword fighting and sensing attacks from the left. In the grand scheme of the series, he is considered 'Yuuko's pawn'. Fei Wong Reed murdered Kurogane's mother in an attempt to make a deal with him, his servitude for the return of his mother. However, this plan was thwarted by Yuuko and Tomoyo when Yuuko warns Tomoyo of this event. This warning leads to Tomoyo ending Kurogane's mad rampage and Kurogane becoming one of her ninjas. He also acquired the Ginryū replica from Tomoyo as the original was to be buried with his mother in place of his father's corpse. Kurogane is an original character and is not from any other Clamp work.
- Fay D. Flourite
- A laid-back mage from the Country of Celes. He is on the run from King Ashura (a crossover character from RG Veda), whom he put into a near-eternal slumber. Although he seems happy-go-lucky and pretends to know less than he does, there is more to him than meets the eye. His assistant in Celes, currently guarding against the awakening of Ashura, is a very organic-looking Chii (a crossover character from the series Chobits)It is also revealed that Fay created Chii according to his mother's looks. Fay is later turned into a vampire at Kurogane's request, to save his life after Syaoran stole his left eye and half his magic. Because he drank Kurogane's blood mixed with the vampire Kamui's, he is able to feed only from Kurogane. During the Celes arc, it is revealed that the Fay from the beginning of the series is actually named Yuui. Fay and Yuui were twins born in a country where twins were bad omens; it was decided that as long as the twins were miserable, the country would flourish. So, Fay was placed into a tower while Yuui was placed into the pit of sinners. This situation is manipulated by Fei Wong Reed; he makes a deal to each of the twins that if one of them were to die, he'd free the other and so, Fay sacrificed his life to release Yuui. Yuui then becomes 'Fei Wong Reed's pawn' and has two curses placed upon him: one that states if there should ever be someone with greater magic than him, he must kill the person and the other (that activates with Ashura's death) that uses him as the core and closes off all worlds to those who are near him as well as himself. When he first meets Ashura, he states his name as 'Fay' in order to keep his brother 'alive'. He uses one of Sakura's feather in order to keep Fay's body alive and all his efforts were to work towards reviving his brother, which ultimately prove to be futile. The tattoo taken by Yūko at the beginning of the series is considered to be Fay's most important object because he was told that it was a countermeasure against his first curse. However, in reality, as using his magic drains him of his life, the tattoo was actually saving him, instead of others, as it kept his magic from taking too much of his life. Fay is an original character and is not from any other Clamp work.
- Mokona Modoki
- A creature given to Syaoran, Fay and Kurogane by the Time-Space Witch in exchange for their most-valued possessions. Whichever world he finds himself in, Mokona can contact his sibling Black Mokona. In chapter 133 of Tsubasa, it is revealed that the two Mokonas were created by Yūko and Clow to help prevent the wish Fei Wong wanted to happen. Soel (white Mokona) has a red earring which enhances magical power when used. This was used back in Celes to try and help Kurogane and Fay escape the closing country. Larg (black Mokona) has a blue earring which is a tool used for sealing magic, which was used to seal one of Sakura's feathers Yūko removed from Kohane Tsuyuri which contained both Sakura's memories of Syaoran and some of Watanuki's memories. This Mokona is not to be confused with Mokona of Cephiro.
- Yūko Ichihara
- Also known as the Dimension Witch or the Space-Time Witch, who resides in modern day Japan, but her shop is technically connected to all dimensions, including the Dream World. She owns a shop in ×××HOLiC, which can grant people their wishes if they in pay the equivalent price. Although Yūko is extremely powerful, to the point of being able to create gods, she cannot act without the request of another beforehand, regardless of whether the events she wishes to pass are selfless or not. She works against Fei Wong Reed.
- A mysterious traveler from Syaoran's past who also gained the power to travel between worlds from Yūko. He is currently searching for the vampire twins and, like his younger brother, he is a treasure hunter, not a vampire hunter like originally believed. His abilities include summoning Oni to fight for him. He is able to perform these abilities with the help one of Sakura's feathers, which Syaoran failed to retrieve in their encounter in Ōto country. An experienced fighter, Seishirō was also the one to teach Syaoran his kicking techniques, and apparently can kick just as well.
- Later, he has appeared in Nihon Country and discovered that Fai had vampire blood. Initially he thought Fai and his friends knew the location of Subaru, but they didn't. With this revelation, he intended to leave Nihon, but was challenged by Syoaran for the feather. Seishirō remarks how Syaoran is like his father, Syaoran Li, implying that he has met him during his travels.
- After Syaoran unleashed his ultimate spell (all four of his elemental spells combined) on Seishirō, he reclaimed the feather and was sent into the Dream alone to rescue Sakura's soul. With this, he reveals to Fūma and the others that he was planning on giving the feather to him anyway and starts revealing a kinder, nonviolent side of himself to Fai and Kurogane. He then starts a conversation with them about how dangerously powerful The Clone is becoming; but not before he tells them that Syaoran is becoming more powerful as well.
- He was last seen viewing the battle between The Clone and Syaoran (both, in a sense, former students of his) before leaving to search for Subaru.
- One of the vampire twins that Seishirō is hunting, he seems to be the only one whom Seishirō is interested in. Upon arriving in the world 'Tokyo', Subaru fell asleep and does not awaken until Syaoran and his friends arrive. He is the protagonist of the manga Tokyo Babylon and also plays an important role in X where he is one of the seven seals.
- The other of the vampire twins whom Seishirō is hunting. His true identity is revealed when he attacks Syaoran's clone in an attempt to use his blood to awaken Subaru. Kamui is originally the protagonist in the manga X. He and Subaru gained the power to traverse dimensions together from Yūko.
- It should be noted that while Subaru really had a twin in the original Tokyo Babylon and X stories, it was not Kamui; in fact Subaru and Kamui were not even of the same age. Instead, Subaru had a twin sister named Hokuto, who, even though she was a major character in Tokyo Babylon and also appeared in X, has yet to make an appearance in Tsubasa.
- Seishirō's younger brother, who is also a treasure hunter and apparent leader of the people of the Tower. He arrived in 'Tokyo' four years earlier along with a feather of Sakura's. Little is known about him right now, but he does seem to have an interest in Kamui and he seems to be friends with Yūko, for whom he retrieves items for whenever he traverses to different dimensions.
- Fūma later appeared in the Nihon Country to give Kurogane a robotic arm. He then stayed to witness the battle between his brother and Syaoran. Afterwards, he teased his brother about his strange actions.
- Fūma was the antagonist in X, opposite protagonist Kamui. In the original story he and Seishirō were merely on the same team and not blood related at all.
- NOTE: Fūma/Kamui and Seishirō/Subaru are two pairs of characters with deeply intertwined storylines in their own original manga, X and Tokyo Babylon respectively, which also crossed over. Their relationships are paralleled in Tsubasa.
- Princess Tomoyo
- The princess of a feudal country called Japan/Nihon who sends the ninja Kurogane on the quest that causes him to join the dimension travelers. Tomoyo is a powerful miko sorceress responsible for maintaining the wards of Nihon that protect the country from demons. She is also a yumemi (dreamseer) with the ability to see into other people's, to enter another's dreams, can send trans-dimensional messages through dreams and is able to see the future in her dreams. However, she gave up her dreemseer power to Yuuko as the price for bringing Kurogane, Fay, Syaoran, and Mokona to Nihon. Another incarnation of her appears in Piffle World, where she retains much of her nature from Tomoyo Daidouji in Cardcaptor Sakura. A crossover character from Cardcaptor Sakura.
- Princess Tomoyo's bodyguard, Sōma is a kunoichi, female ninja, of Nihon working alongside Kurogane to protect Tomoyo. She appears to be very loyal and protective to Tomoyo, yelling at Kurogane for getting mad at her.
- An alternate version of her was seen in Ōto country where she was an oni hunter alongside her partner. Her weapons were a pair of boomerang daggers.
- When the Tsubasa gang came to Nihon country, she welcomed them and was present to view the battle of Syaoran and The Clone. Recently, Tomoyo revealed that Sōma always worries about Kurogane due to his brash actions. Whether or not this means she harbors feelings for him has not yet been revealed.
- King Ashura
- The King of Celes, who brought Fay up. Fay places Ashura in an enchanted sleep at the beginning of Tsubasa and transforms Chi to serve as Ashura's guard. Ashura is the reason why Fay seeks to travel to multiple dimensions and avoid returning to Celes. Fay, at one point, says that Ashura 'took him out' of someplace, later revealed to be the place Fay (then Yuui) and his twin were imprisoned in their native country. King Ashura finally wakes up from his sleep in chapter 140. It is then revealed that Ashura regularly went on killing sprees among his subjects, and he intended to invoke Fay's curse to kill him. To this end, he placed a tattoo on Fay which would prevent the growth of his powers, while his own grew with every murder, and he would one day be stronger than Fay. He is later killed by a combined effort from Syaoran, Fay, and Kurogane.
- King Ashura is a crossover character from RG Veda and should not be mistaken for another crossover character from RG Veda, Ashura-ō, who is this Ashura's son in RG Veda. (Ashura-ō means King Ashura and is a title also used as a name in RG Veda, which both of these characters bear, though there the son is usually referred to as "Ashura".)
- Clow Reed
- The sorcerer who is tied to the storyline, but does not appear directly as he is already deceased before the story begins. Clow Reed was the creator of the Clow Cards and the original Card Sealing Wand (as seen in xxxHolic' volume 1) and the co-creator of the two Mokona Modokis. A crossover character from Cardcaptor Sakura. He and Yūko appear to have had a strained but close relationship. Another incarnation, who is also deceased before the story begins, is the father of the Sakura and Tōya of Tsubasa.
- Kimihiro Watanuki
- Watanuki has appeared numerous times in more recent chapters of Tsubasa: RESERvoir CHRoNiCLE. A connection between Watanuki and Syaoran has been emphasised, but it is unclear what the connection is. Watanuki has paid all of his memories before meeting Yūko as a price to locate both Sakuras. A crossover character from ×××HOLiC.
- Fei Wong Reed
- A mysterious and powerful villain who is after Sakura's feathers. He is later revealed to be a direct descendant of Clow Reed and well aware of the powers of the Dimension Witch. He was the one who imprisoned the real Syaoran and created the Syaoran who is the protagonist of Tsubasa. Though he already possesses the power to cross dimensions like the High Priest of Clow and Princess Tomoyo, he seeks the power of Sakura's wings to "bring back a dream that has already ended" which is foreshadowed in TRC and ×××HOLiC to involve reviving someone who has died (possibly Clow Reed himself). He is ruthless in pursuing this dream and not care on how much blood has to be shed to get that power; those he has killed (or arranged to be killed) include Kurogane's mother, Xing Huo and the real Fai. His true objective is not to obtain Sakura's feathers; rather, the scattering Sakura's memories was to force her to travel between dimensions so her physical memories would contain a map of the dimensions. This is necessary, in combination with the ruins below Clow country, to grant Fei Wong's wish. In Chapter 122 of xxxHoLiC, Yuuko reveals in a monologue that he is responsible for the soul stealing entities featured in Volume 5. Also, in chapter 181 of Tsubasa, Yuuko also reveals that this was when she discovered his whereabouts and that he needs the souls for the sake of his dream. Following the souls leads to his location.
- It has also been revealed in chapter 178 of Tsubasa that the Sakura travelling with the Tsubasa group is, in fact, a clone. He has kept the real Sakura's soul alive for the sake of his dream, but the body has "disappeared" (although, in another translation it says her body was "destroyed"). Clone Sakura's soul has been killed, though he still needs her body which was taken by his assistant Kyle Rondart.
- In chapter 181 a revelation was made: His location. He is located in a "cut-off" time of Clow Country, from the words of Yuuko.
- Xing Huo
- Fei Wong's assistant. Not much about her is known besides the fact she is Fei Wong's assistant and was somewhat also a "failed creation". However, as the story progresses her character has more depth. In Volume 15 of the manga she helps the real Syaoran go to Yūko after he awakened (Volume 09 of ×××HOLiC), but stated she can only do it once. Her reason to him was "If the dream does not end." She is killed by Fei Wang shortly afterwards, using a blade similar to the one that killed Kurogane's mother. Her helping Syaoran was inevitable, as Fei Wang Reed states "Considering your origins, I suppose it couldn't have been helped". In Chapter 178 she make an appearance in a flashback of her and Fei while he was explaining the clone soul of Sakura, along with other girls who are also crossed over from other Clamp works.
- Kyle Rondart
- An agent of Fei Wong Reed, first introduced in Jade country as the good doctor who was helping the village with their problems around the time the children started vanishing. He seems kind and sincere at first, but we later find out that through hypnotism he was the one that sends the children (most of them his patients) to the old castle to dig out Sakura's feather. He re-appears in Piffle World as the very same person, knowing that Syaoran and his friends will likely assume he is just another incarnation of himself. In Piffle World he tries to sabotage the race to get Sakura's feather, but later escapes without it. Kyle has recently returned, kidnapping the Clone Sakura's body and taking the feather after the her soul was destroyed. Upon his leaving, Syaoran desperately calls out for him to wait, but it is too late. In chapter 181 he is seen along with Fei Wang and Clone Sakura's body.
Tsubasa contains various crossover characters from various Clamp series, including Cardcaptor Sakura, RG Veda and ×××HOLiC. It should be noted that, excluding the Dimensional Witch and related characters, none of these characters are the same characters from their original works, but new incarnations of the same ones. Noticeable names and faces show up including Miyuki of Miyuki-chan in Wonderland who appears in almost all the major worlds the group visits usually with a piece of toast in her mouth or another bread product.
The following characters are seen when the group return to Clow Country in the final arc: