Kurosaki Ichigo

Brief History
Kurosaki Ichigo is the main charector of Bleach. He lives with his father and his 2 little sisters. His life for the most part was normal, except for one thing, he can see spirits. One day he sees a girl in a black samurai like attire battling a monster in town. Later that night a monster attacks him and his family. the girl shows up again, but is unable to defeat the monster. So Ichigo, determined to save his family, lunges the girls sword into himself, thus turning him into a Shinigami.

Ichigo the Shinigami
From the first moment he became a shinigami, he was different. His zanpakuto was larger than any before it. His powers were also far greater than they should be considering they were originally Kuchiki Rukia's. in his fight with Kuchiki Byakuya his Zanpakuto was destroyed and his shinigami powers cut off. Urahara then helped Ichigo to regain the ability to become a Shinigami by showing him how to tap into his own power. He regained his Shinigami ability and learned the name of his Zanpakuto, Zangetsu (Cutting the Moon).

Zangetsu

Zangetsu is the biggest zanpakuto out of all of them. It is also the only one that seems to have a humanoid spirit inhabiting it.

Shikai-Zangetsu's Shikai is culminated in the Getsuga Tenshou(Stabing the Heavens) although he can use this during Bankai too.

Bankai- Tensa Zangetsu. It is a long black katana. The true ability of Ichigo's Bankai is that it condenses the entirety of his zanpakuto's combat ability into a small form. This allows for ultra high speed combat through multiple, rapid flash steps. He can still use the Getsuga Tenshou while in bankai.

Ichigo The Vizard
After ichigo lost his Shinigami powers at the hands of Byakuya, Uruhara had to use a technique on Ichigo to give him access to his own Shinigami powers. This technique however had to put Ichigo on the road to becoming a Hollow. Although he didn't, it created a Hollow within him. The Hollow continuously takes over Ichigo. Eventually the other Vizards teach him to control his hollow powers. Afterwards he can pull on his hollow mask at any time. His Getsuga Tenshou from then on, weather he is in hollow form or not, is black. The first time he fought Grimmjaw as a Vizard he could only keep his mask on for 11 seconds. The second time he faces Grimmjaw in Los Noches, Ichigo was able to keep his mask on for most of the battle. he lost it after Grimmjaw was to hurt to even stand up to Ichigo without it. It seems that his Hollow powers keep increasing so we'll have to wait and see how strong he gets.