Yumichika Ayasegawa

is the 5th Seated officer in the 11th Division of the Gotei 13, his captain is Kenpachi Zaraki.

Appearance
Yumichika is the narcissist friend of Ikkaku Madarame. Yumichika is a powerful combatant and wanted to become the 3rd Seat, since he thought the kanji for the number three was the most beautiful, though Ikkaku took it, so Yumichika took the 5th Seat, as he thought that the kanji for 5 resembled 3. He has colorful feathers on his eyelashes and eyebrow, and shiny skin and hair, giving him a rather womanly appearance.

Personality
Yumichika judges everyone and everything by beauty, and is also incredibly vain. However, he is at times shown to be caring and helpful to others. He is extremely loyal to his friend Ikkaku even going as far as to abandon his post at a pillar in the fake Karakura town to try and save Ikkaku from being killed. He cares deeply about what Ikkaku thinks and hides the true nature of his zanpakutō from him for fear of being hated. He, along with Renji Abarai, Tōshirō Hitsugaya, Rangiku Matsumoto and Tetsuzaemon Iba are the only people who have seen Ikkaku's Bankai, although Keigo Asano also might have seen it. Whenever he uses an Artificial soul to leave his Gigai, his personality changes to a rather violent and irritable one.

History
Yumichika was a friend of Ikkaku Madarame from a long time ago, before Zaraki was a captain. During their past, the two went throughout the Rukongai together looking for fights, and one day Ikkaku lost to Kenpachi Zaraki.

After a speech given to them by him about living to kill the one who failed to kill them, and later after hearing news of Kenpachi becoming a captain, the two joined the 11th Division to serve under him. Both of them would prove themselves to Zaraki and eventually became seated officers, Yumichika choosing the 5th seat as Ikkaku had already taken the 3rd.

Soul Society arc
Yumichika, alongside Ikkaku, finds Ichigo Kurosaki and Ganju Shiba shortly after they arrive in Seireitei, and Yumichika fights off Ganju. Ganju spends most of the time running away and playing unsuccessful tricks, though he manages to defeat Yumichika with a type of blast bomb. He later fights 9th Division lieutenant Shūhei Hisagi, when he tries to stop Kenpachi from helping Ichigo's friends, and wins by releasing his Zanpakutō.

Bount arc
When the Bounts begin attacking living humans, Tōshirō Hitsugaya puts together a team of Shinigami consisting of Yumichika, Shūhei Hisagi, Rangiku Matsumoto, and Izuru Kira. Yumichika questions Hitsugaya as to why he was elected for the assignment. Hitsugaya explains that Kenpachi told him that Yumichika was the only one "with nothing better to do". Initially, Yumichika is the only one working on his own when the team arrives in Karakura Town, while the other Shinigami sent are assisting Ichigo and his friends who are dealing with the Bounts. Yumichika eventually manages to find the Bounts' main hideout, but decides to wait for the rest of his team.

When the rest of the team Hitsugaya organized arrives, Yumichika decides to go ahead on his own, but he (along with the rest of the group) is defeated by Ugaki's Doll. He is later found by Ichigo and Renji Abarai, who arrive later. They decide to carry Yumichika along, but they are all confronted by by Ugaki and his Doll in its full form. Renji decides to fight on his own, insisting that both Ichigo and Yumichika stay out of the battle. Ichigo shows numerous protests even during the battle, but Yumichika reveals to him that Renji used to belong to the 11th Division; and most members of the 11th Division fight to the death on their own, Renji being no exception (even after he was transferred). After Renji defeats the Doll, he can no longer continue. Yumichika urges Ichigo to continue on, telling him that he would look after Renji, so he wouldn't have to worry about him.

Yumichika also heads 11th Division matters along with Ikkaku, while Kenpachi and Yachiru are unable to.

Arrancar arc
Yumichika is later assigned to Tōshirō Hitsugaya's team to fight off the Arrancar. During the attack led by Grimmjow, he prevents Keigo Asano from interfering with Ikkaku's battle with Edrad Liones. During the third invasion led by Luppi, Yumichika takes part in the battle against him, but loses.

Fake Karakura Town arc
When Aizen and the top three Espada invade the fake Karakura Town, he along with Ikkaku, Shūhei and Izuru Kira, are left to protect the pillars that hold the real Karakura Town in Soul Society. Barragan Luisenbarn sends his Fracción to do battle at each point, with Yumichika getting paired with Charlotte Cuuhlhourne. Though initially their somewhat similar personalities cause an argument in a comedic fashion, the fight quickly turns serious, with Yumichika getting overpowered by Cuuhlhourne's attacks. He provokes the Arrancar to release his sword by slicing part of his hair after getting called his rival, greatly annoying himself. After Cuuhlhourne uses his ability, Rosa Blanca, to conceal the fighters completely, Yumichika in turn activates his sword's true form, Ruri'iro Kujaku, and drains his Spiritual Energy.

As Charlotte asks if that form was the second stage of a Zanpakutō, a Bankai, Yumichika reveals his reasons to keep the true self of his Zanpakutō a secret from everyone else. He then takes a small bit of one of the petals to heal himself.

He is later surprised, along with the other Shinigami present, that Ikkaku lost his fight and becomes erratic and proceeds to go to his friend's aid. Hisagi tries to calm him, but Yumichika does not listen to him. This causes Izuru to knock him out, stating that his manners are not appropriate when addressing his superiors and that he needs to calm himself.

Powers & Abilities
Expert Swordsmanship Specialist: Despite being a 5th seated officer, it has been shown that Yumichika is capable of fighting on par with lieutenant-level Shinigami, especially when he uses the full power of his zanpakutō.

Flash Steps: Yumichika has been seen using flash steps frequently, although he only uses it to keep up with stronger opponents.

Zanpakutō
, "Nickname". It has the form of an average katana with a bronze rectangular guard and purple handle. According to Yumichika, the Zanpakutō's favorite color is azure, and its least favorite is wisteria purple. Hence, when he calls his sword Fuji Kujaku instead of its true name, it sulks and won’t achieve its true power. It is only when he calls it by its true name, that its potential is achieved. Although Yumichika does not admit it to his 11th Division comrades for fear of being hated, especially by Ikkaku, since 11th Division Zanpakutō are generally used for direct attack, and he has a Kidō-type Zanpakutō.


 * Shikai: The Shikai command for Fuji Kujaku is . As Fuji Kujaku, it takes the form of a sickle-shaped blade, or falx, distinguished from the khopesh by the cutting edge being located on the inside. A hinge at the hilt allows it to split into four identical blades. The guard takes the form of bronze cross and it retains the purple handle.
 * Shikai Special Ability: By using the command, Yumichika says the command release and Ruri'iro Kujaku flares up and its blades transform into a number of glowing peacock feather-like vines. These vines move to grapple and ensnare an opponent, once a opponent is sufficiently subdued the vines begin growing energy buds that are being filled with the opponents reiatsu, the flowers actually use the reiatsu as a form of power source, siphoning the reiatsu the opponent emits in order to fuel their growth. When the flowers bloom the collected reiatsu is turned against the opponent, either seriously incapacitating them or killing them in the process. By chewing on the petals of the bloomed flowers ones wounds can be healed and their reiatsu is revitalized. (It should be noted that the command Split and Deviate is the true release command for Yumichika's Zanpakutō).


 * Bankai: Not Yet Achieved. It is also assumed he is trying to learn his Bankai, though Ruri'iro Kujaku is just as narcissistic as Yumichika himself, leading Yumichika to comically yell at his sword while trying to break it against a boulder, it also doesn't help that Yumichika does not often refer to him by his real name.

Trivia

 * Ruri'iro Kujaku was revealed for the first time when Yumichika battles Charlotte Cuuhlhourne. However, its true nature was in fact hinted at as early as the Soul Society arc (which is where he was first introduced), when he defeats Hisagi easily, without even a wound, and an enraged Hisagi commented that Yumichika's Zanpakutō has drained all of his spiritual power.


 * In the anime, perhaps intentionally, Yumichika's eye color is ironically wisteria. When he releases Ruri'iro Kujaku, his eyes and reiatsu glow azure green.


 * Powerful as it is, Yumichika only makes use of his Zanpakutō's Kidō properties when no other member of the 11th Division is around, lest they witness the true nature of his Zanpakutō and ridicule him.


 * In the anime's Bount arc Yumichika was seemingly easily defeated by Ugaki's doll Gezel, it is unknown as to why he didn't use his Zanpakutō's true form since they were both alone in cave with no one to witness (although this was, also far before he ever revelead his Zanpakutō's true name in the manga.)