Gaia Online

Personality
Izuru is a gloomy and introspective person, not easily given to socializing with others. He generally appears weak and indiffrent, leading many to believe he lacks ability as a leader. As an officer, he does not tend to inspire confidence or boost morale the way other lieutenants do.

His personality flaws are also assets: his introspection coupled with his tendency to worry makes him indecisive, but it also makes him sensitive to unusual behavior. His loyalty to his comrades inspires him to great efforts in their defense, as seen when Momo Hinamori attacks Gin Ichimaru and again in the anime when Makoto Kifune's attacks endanger other members of the 3rd Division.[4][5]

Izuru is loyal to both his friends and his duties, perhaps to a fault. Despite the close friendship he shares with Momo Hinamori, Izuru shows that his loyalty knows no boundaries when he defends his captain while she is in a grief-induced rage from her own captain's apparent death.[6] Despite this, he calls himself a 'monster' afterwards for raising his sword against her.[7]

During his fight with Avirama Redder, it is revealed that Izuru considers the essence of war to be despair, as exemplified by the symbol of his division, the marigold. He also hates to fight unless prompted or given orders. However, in combat he shows ruthless determination. Izuru has shown himself remorseless with this, beheading an opponent that was pleading for mercy.[8]

It is known that he likes to write haiku, and he was also awarded for one of his pieces by Seireitei Communication, which is as follows: "The persimmon tree bears fruit. Aaah, the persimmon tree bears fruit again this year." His dislike for dried persimmon (a huge difference between him and his former captain) sheds some light on the background of the poem. He likes agar-agar instead. He also writes a serial novel titled "I Want to Apologize to You". It runs in Seireitei Communication and every new chapter begins with a haiku piece. He is on good terms with fellow author Shūhei Hisagi, and in their free time, they participate on gatherings of haiku-lovers. Izuru also gives a special lecture of poetry on the Shinigami Academy. It is also known that he is skilled in playing cat's cradle.
----------------------------------------------------------------------------------------------------------
History
Izuru Kira was born to a family of lesser nobility, his parents having been dead since he was young. While in the Shinigami Academy, Izuru befriended Momo Hinamori, Renji Abarai, and Shūhei Hisagi, and they are often seen spending time together.[10] After graduation, Izuru, along with Renji and Momo, were sent to the 5th Division, where he stayed until Gin Ichimaru became captain of the 3rd Division. It was revealed during the Fake Karakura Arc, that Izuru spent some time in the 4th Division, as noted by Shūhei, and the fact that he carries medical implements like shinten, a trait virtually exclusive to members of the 4th Division.
----------------------------------------------------------------------------------------------------------
Powers & Abilities
Expert Swordsmanship Specialist: Izuru is shown to be highly proficient in the wielding of his Zanpakutō. Mixing his mastery of his swords unique shape with the special ability it has, he is coldly proficient during it's use and application.

Expert Tactician: He is highly conscious of his weaknesses and strengths, commonly devising methods which take advantage of his Zanpakuto's special ability, even in situations when the odds are against him.

Kidō Expert: He has great talent for Kidō even back at the Shinigami Academy, and he is often seen applying Kidō spells during fights. He is even skilled enough to use a Level 58 destructive spell and a level 73 binding spell without incantation and with relative ease, as well as being proficient in healing Kidō due to his time spent as a member of the 4th division.

Flash Steps: Kira is proficient in the use of flash steps allowing him to keep up with at least other Lieutenant level Shinigami.

Healer: It was noted by Hisagi that Izuru was once part of the 4th division and therefore knows Healing-type Kido and techniques, though he is considerably out of practice.[34]

High Spiritual Energy: Being a lieutenant of the Gotei 13, Izuru boasts a high spiritual energy.
----------------------------------------------------------------------------------------------------------

Zanpakutō
Wabisuke (侘助; roughly "Miserable Man", translated in the English manga as "the penitent one"): Wabisuke is very simple and plain in design. Its normal form is indistinguishable from a plain katana. The crossguard is a normal rectangular one, with only an omega design ("omega" as in the Greek letter) on the top and bottom half.
* Shikai: Its Shikai command is "Raise Your Head" (面を上げろ, omote o agero). When activated, the blade loses its curve and straightens, and where a normal katana would end, Wabisuke's blade makes two 90 degree angles, forming three sides of a square reminiscent of a hook. Even more interestingly, it looks like the cutting edge of the blade is on the inside of the angles, not the outside.[35]

Shikai Special Ability: In this form, Wabisuke doubles the weight of whatever it strikes. The ability can affect both inanimate objects and living beings, and is cumulative. For example, the first strike on an opponent (whether it's a hit or is blocked) wielding a 10 lb sword doubles the opposing sword's weight to 20 lbs. Izuru then strikes twice more. The weight of the sword doubles to 40 lbs then 80 lbs. The opponent is now very slow, holding a sword that weighs 80 lb, so to be sure Kira strikes again, doubling its weight to 160 lbs, then again to 320 lbs. By this point, most opponents cannot lift their swords and are brought to their knees by the weight of their own weapon. The potential of this ability is limitless, though a small number of strikes to an opponent's blade is usually all that is needed to render them immobile. This is perhaps a poetic effect of Izuru's weapon. Its ability makes it looks like he is forcing his opponents to bow their heads in apology for a past decision, as it brings his opponents to their knees before him.[36] The hook end of his blade then shows its gruesome function: Izuru can decapitate a fallen opponent by holding the square hook beneath his opponent's neck and lifting, like a reverse guillotine.[37]

* Bankai: Not Yet Achieved