|Previous Affiliation||Gotei 13, Soul Society|
|Position||Commander of Aizen's Arrancar Army|
|Previous Position||Captain of the 9th Division|
5th Seat of the 9th Division
|Previous Division||9th Division|
|Partner||Sōsuke Aizen, Gin Ichimaru|
|Previous Partner||Shūhei Hisagi|
|Base of Operations||Las Noches|
|Bankai||Suzumushi Tsuishiki: Enma Korogi|
Tosen has dark skin and dark brown braids. He has pupil-less eyes that are a pale lavender and has been blind since birth. While a captain he wore the traditional Shinigami uniform with the sleeves rolled up to the shoulders and his captain's haori over it; the uniform is tied with a purple obi sash. He also wore an orange scarf around his neck, white boots (instead of the normal sandals), and black, fingerless gloves. He usually wore clear goggles, although this was not always the case. He kept his hair tied back in a ponytail.
Tosen, like Sōsuke Aizen and Gin Ichimaru, has changed his outfit after defecting from the Soul Society, wearing clothing similar to the Arrancar and having his braids let down. He wears a white, sleeveless coat over black hakama, white boots, longer gloves, band-like visor, and an orange rope coming from his right shoulder running across his chest to under his left arm. With this outfit, he carries his Zanpakuto. The white coat and black hakama are later changed for a single longer, white robe while his boots are replaced by typical Arrancar footwear. Kaname's Zanpakuto is suspended from a string-like attachment on the left of his robe.
Tosen's creed in life is to "take the path with the least bloodshed"; it was for this reason that he felt it necessary to follow Aizen. Despite this, he knows of Aizen's plan to create the King's Key, which will require the deaths of thousands of innocent people. He is ultimately rather hypocritical, as his claims of justice are a facade to cover up the fact that he hates the world because his friend was killed without getting justice.
Tosen also has several unique relationships with the Arrancar. Tosen thinks of Grimmjow Jaegerjaquez in the same manner as Kenpachi Zaraki; a killing machine that will cause only more bloodshed in the world. Wonderweiss Margela seems to have a large affection towards him. Tosen explains that this is because they are both pure spirits, and that pure spirits tend to attract and follow each other.