Toshiro Hitsugaya

Tōshirō Hitsugaya (日番谷 冬獅郎, Hitsugaya Tōshirō) is the Captain of the 10th Division in the Gotei 13. His lieutenant is Rangiku Matsumoto.
Tōshirō Hitsugaya is short, has turquoise eyes and short, spiked, white hair, which tends to draw attention in the Human World. He wears a standard sleeveless captain's haori with a green sash around his shoulders, held together by a round star-like clip. The sash holds his Zanpakutō's sheath in place on his back and is tied to it at either end. He sometimes walks around in his tabi. He is relatively young by Shinigami standards and has the appearance of a child. In the Human world, he wears a black, short-sleeved, golf shirt and gray pants. He also wore the uniform of Karakura High School.

A year and a half after Aizen's defeat, shortly after Ichigo regains his Shinigami powers, Tōshirō appears sporting a hairstyle similar to that before he became a Shinigami, and a long turquoise scarf. His green sash is also changed to a thin chain, but it still retains the star-like clip.

Hitsugaya is generally mature and serious, in contrast to his free-spirited lieutenant, Rangiku Matsumoto. Despite their personality differences, he and Rangiku seem very close. Tōshirō is shown to be easily annoyed by others goofing off or drawing unneeded attention to themselves, as shown when he leads a team of Shinigami into Ichigo Kurosaki's school. Hitsugaya hates anything that he deems childish as well as being described as something close to a child, such as an elementary school child. He is overly protective of Momo Hinamori, due to the fact that they were old childhood friends. Hitsugaya dislikes summer and warm weather in general.

Tōshirō's favorite foods are watermelon and amanattō. He does not like dried persimmons. Back in his childhood in West Rukongai, he was so skilled with spinning tops that he became the local undefeated champion. He works very hard, but his motive seems to be that if he finishes quickly, he can return to his afternoon nap. He believes in the saying "children who sleep well, grow well," and hopes to grow quickly, a wish shared by his subordinates. Naturally, they do not voice this fact in front of him, for even regularly practicing this adage for so long, he didn't really grow in height .

Hitsugaya is usually joked about by many of the other Shinigami in Soul Society as well as by his enemies. Despite these jokes, or perhaps because of them, Hitsugaya has developed a cold attitude toward most people; he tolerates these jokes and goes on with his duties. Although he has shown anger towards jokes, he doesn't take action against whomever insulted him unless they are his enemies, but has never overreacted because of them. The only thing he can't tolerate is not being addressed as "Captain Hitsugaya," or an inappropriate use of his name, as he worked very hard for the title so he gets angry when not addressed as such. Coincidentally, though, he does not address any other officer with their title, only their last names. The only people that actually call him by his given name are Ichigo, who is constantly reminded to address him properly, and Hinamori, who is the only person allowed to get away with it. Hinamori tends to call him "Hitsugaya-kun" and both she and Ukitake occasionally use "Shirō-chan" (シロちゃん) — a nickname meaning "Whitey" (Snowy in the English manga) in reference to his hair — in both cases without any repercussion. In addition, Karin and her friends call him by his first name and they are never given any rebukes for it. In the Shinigami Illustrated Picture Book sketches (omakes found at the end of episodes of Bleach), Jūshirō Ukitake comically gives Hitsugaya candy and other food because "Jūshirō" and "Tōshirō" sound similar and because they both have white hair, making them both "Shirō-chan."

During his duel with Gin Ichimaru, Ichimaru remarks that Hitsugaya is the embodiment of a heavenly
guardian that would be reincarnated every few centuries.

Shikai Special Ability:
Hyōrinmaru allows Hitsugaya to control water and ice. His slashes create an immense amount of spiritual power which overflows from the tip of the blade, creating a flow of ice shaped like a Chinese dragon. The dragon flies towards opponents and instantly freezes anything it touches. Hyōrinmaru can create multiple ice dragons to attack an opponent from various angles. Hitsugaya can also direct his slashes towards the ground and form a wave of ice which rushes over his opponents, overwhelming and freezing them.[128] The chain-blade also freezes anything Hitsugaya traps with it. The power it expels is so overwhelming that in Soul Society (where Hitsugaya is not placed under a limiter), its mere release affects the weather within the immediate vicinity, creating a thunderstorm or a blizzard.

 
Bankai:
Daiguren Hyōrinmaru (大紅蓮 氷輪丸, "Grand Crimson Lotus Ice Ring"; Viz "Great Roaring Coldly Shining Moon"): causes ice to flow from Hyōrinmaru onto Hitsugaya, starting at his right arm which ice forms onto in the shape of a dragon's head around his sword hand, encasing the sword up to the hilt; which also changes from the shape of a four-pointed star to that of eight-pointed star. The ice continues forming up over his shoulders with two large wings sprouting from his back and a long tail. The ice forms down his left arm encasing his hand which ends in a claw. Hitsugaya's feet are encased in ice in a similar manner to his left hand which as they to end in claws. These new ice limbs are movable and can be used as an extension of himself to aid in battle. During some appearances of his Bankai, three flowers of ice form floating behind him, each consisting of four purple petals shaped like diamonds. These petals melt away petal by petal as Hitsugaya's battle progresses, leading Shawlong Kūfang to speculate that Hitsugaya's Bankai will fade when all twelve petals disappear, assuming that the captain's Bankai was incomplete due to his young age. During his fight with Luppi, these petals were noticeably absent; however, during his fight with Tier Harribel, they were present once more and they also appeared once again with his fight with Aizen.

 Info from :  http://bleach.wikia.com/