Ririn

is a Modified Soul, created by Kisuke Urahara to serve as a Bount detector.

Appearance
Ririn, while in her Gigai form, is a small girl with short blonde hair and bright blue eyes. She wears a pink, fur-trimmed coat, a black bird-shaped cape, and red boots. When she was testing Ichigo and his friends, she carried a pink clock with a golden heart handle.

While not in her Gigai, she inhabits an bird-shaped plushie with a blue-hooded coat and red bowtie.

Personality
Ririn considers herself to be the leader of the three Bount-sensing Modified Soul (herself, Noba, and Kurōdo), and has a marked fondness for games. She is partnered with Ichigo Kurosaki. At first she dislikes him due to their sometimes-conflicting personalities, but grows to be very fond of him, even becoming jealous of Rukia Kuchiki's close relationship with him. She is immature and arrogant at times, but shows genuine concern for her friends, going so far as to step into harm's way several times to help or save Ichigo, Rukia, Kon and the others. She often appears to consider Kon inferior to her and her two comrades, which causes frequent arguments between the two.

Bount arc (anime only)
Note: Events occurring in this arc are only in the anime and do not constitute canon material. Ririn instructs Kurōdo to disguise himself and retrieve Orihime Inoue. She then tests (in the form of forced "games") Ichigo Kurosaki and his friends by telling them a series of locations and corresponding time limits to reach them. Once they successfully follow her orders, Kurōdo disguises himself as Orihime in order to kidnap Yasutora Sado. Ririn uses Noba's ability to create a maze, which Uryū Ishida finds a way out of. Keeping her word, she returns Chad and Orihime, only now Kurōdo is posing as one of them. After Ichigo and his friends discover that Kurōdo is posing as Sado, Ririn announces that the final game is now beginning because they must find the real Sado. Ririn then proves to be in league with Kisuke Urahara, and that she and her friends are Mod-Souls.

After explaining to Ichigo and his friends about the Bounts, Urahara decides to assign each Mod Soul to Ichigo and his friends. Ririn gets assigned to Ichigo, which initially upsets her, since she doesn't like him at first. She also meets Kon at Ichigo's house shortly after (accidentally) acquiring a stuffed bird plushie body (beating him up because she wasn't satisfied with the body she ended up with). She later joins Ichigo and his friends in assaulting Jin Kariya's manor, but she, Kurōdo, and Noba are beaten by Maki Ichinose.

After the Bitto are released, Ririn goes hunting for Bounts along with Ichigo and they end up fighting Gō Koga and his doll, Dalk. Ririn assists Ichigo a little in his fight to save Keigo, but Ichigo is eventually cornered and is ultimately separated from him. Izuru Kira arrives to assist them, thus forcing Koga to retreat. Later, Ririn arrives at Urahara Shop with Kon to get help for Ichigo, but finds out that he already arrived beforehand and that he is fine.

The next day, Ririn joins Ichigo and his friends when they decide to assault the Bounts' hideout. However, Ugaki's Doll takes them all by surprise, and she, along with the rest of the Mod Souls, is forced to stay behind with Chad, Orihime, Rukia, and Rangiku. When Uryū Ishida stabilizes the Bounts' Senkaimon, she joins Ichigo and his friends when they head into Soul Society to fight the Bounts.

Due to a fit of jealousy towards Rukia, Ririn flies off on her own to look for the Bounts, but she ends up finding Rukia after she gets into a fight with Yoshi. She tries to assist Rukia to fight off Yoshi, but Yoshi is able to defeat Rukia anyway, and Ririn sustains some injuries as well. They are both saved by the timely arrival of Byakuya Kuchiki, Rukia's adoptive older brother.

Arrancar arc
After Ichigo goes off to dispatch a Hollow and lets Kon inhabit his body, Grand Fisher finds Kon and mistakes him for Ichigo and he chases him throughout the town, but Ririn, Kurōdo, and Noba save Kon and try to fight off Grand Fisher, but he manages to expose Kurōdo and Ririn's illusion and manages to catch up to Kon again. However, before Kon could be killed or Ichigo's body could be destroyed, Isshin Kurosaki arrives, donned in Shinigami robes. Ririn, Kurōdo, and Noba watch him as he kills Grand Fisher. Later, Kisuke Urahara arrives and reveals that he knew that Isshin was also a Shinigami. Urahara requests to all four Mod-Souls to keep Isshin's Shinigami status a secret from Ichigo and his friends. They also discuss Aizen's plans and reveal their knowledge about the Visoreds.

Later, a trio of Arrancar invade Karakura Town, determined to find Urahara and make him explain to them how the Hōgyoku works. Patros the leader of the trio, arrives at Urahara Shop, hoping to find Urahara, but instead has to fight Renji Abarai. Ririn, Kurōdo, and Noba decide to fight as well, but even with their help, Renji seems unable to beat them. However, Ririn manages to figure out Patros' strategy; he needs to sheathe his sword (or, in his released state, withdraw his appendage) in order to gather energy for another attack. She decides to confront Patros on her own and sets up many illusion copies of herself, Kurōdo, and Noba. At this point, Patros is already fully aware of Ririn's illusion powers and fires an attack to incapacitate Ririn, but this turns out to be her plan. Noba uses his powers to warp Kurōdo to a point where he is able to stop Patros from withdrawing his appendage, so he would no longer be able to attack. This provided enough of a distraction for Renji to emerge and finish Patros off with a Hikotsu Taihō.

Urahara, Chad, and Tessai finally return after the battle has ended, and Urahara reveals that the Hōgyoku Patros obtained was a fake. He further speculates that Sōsuke Aizen decided to use these rebels as a distraction for some unknown purpose (which was really so Ulquiorra Cifer could reanalyze the site where he and Yammy Llargo first encountered Orihime Inoue, since Aizen gained an interest in her powers). Later, during the aftermath of Ulquiorra's invasion of Karakura Town, she - along with her fellow Mod Souls, Jinta Hanakari, Ururu Tsumugiya, Tessai Tsukabishi, and Kisuke Urahara - sees off Ichigo Kurosaki, Yasutora Sado, and Uryū Ishida when they head into Hueco Mundo to rescue Orihime, although Kisuke Urahara asked Ririn and her fellow Mod-Souls to step back because it might be too dangerous for them, much to Ririn's dismay.

The New Captain Shūsuke Amagai arc (anime only)
Note: Events occurring in this arc are only in the anime and do not constitute canon material.

Ririn and the other Mod-Souls argue with Enryū, who is refusing to let them enter Urahara's Shop.

Beast Swords arc (anime only)
Note: Events occurring in this arc are only in the anime and do not constitute canon material. In the Human World, it is learned that several Zanpakutō Spirits were brainwashed to betray their Shinigami partners by a rogue Zanpakutō Spirit named Muramasa. Although Ichigo and the Shinigami are able to stop Muramasa restore most the spirits, several of them already succeeded in killing, resulting in them transforming into what are known as Tōjū. While Ririn and her fellow Mod Souls argue about whether or not to pity Muramasa as he was also betrayed by his Shinigami partner, Rangiku and her Zanpakutō Spirit Haineko arrive and barge in, much to Ririn's anger.

Gotei 13 Invading Army arc (anime only)
Note: Events ocurring in this arc are only in the anime and do not constitute canon material.

Noba is with Urahara and the others while Urahara is unable to detect Ichigo's Reiatsu after he disappeared in the Dangai. Kon reassures everyone that he will be fine.

Powers & Abilities
Illusions: Ririn was designed with the unique ability to make illusions. She can change the appearance of an environment, which she uses to confuse opponents, then either Kurōdo, Noba, or herself will charge in to attack. (Unnamed)

Enhanced Speed: Ririn has been noted to be surprisingly fast. Each time Ichigo approached her in her Gigai, she was able to outmaneuver him.

Advanced Reishi Sensors: Like Kurōdo and Noba, Kisuke Urahara created Ririn with the ability to detect and locate Reishi from great distance of various types, including the unique nature the Bounts or their dolls generate.

Keen Intellect: Ririn is also clever and intelligent, as she was able to combine her powers with Noba's to produce a complex labyrinth that only Uryū was able to figure out after a while. Her love for games only fueled her imagination, making her quite the clever trickster.

Enhanced Durability: As a Mod Soul in a Gigai, as long as Ririn's Gikon is not damaged, she cannot die, regardless of what happens to her body. Ririn is durable enough to survive separate assaults from Hollows, Shinigami, Bounts, and Arrancar.

Appearances in Other Media

 * In Dark Souls, Ririn inhabits her plushy body and uses her teammates, Noba and Kurōdo (in their plushy bodies), in her specials. It should be noted that their names are misprinted.
 * Ririn features on an edition of the Second Session of Bleach Beat Collection, where Yumi Kakazu performs two of the three tracks as Ririn: "Faitengu Souru (Fighting Soul)", "GAME! GAME! GAME!," both of which are trios with Noba and Kurōdo.

Trivia

 * In the English dub of the anime, Ririn's name is romanized as Lirin.

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