He is the captain of the Tenth Division in the Gotei 13. His lieutenant is Rangiku Matsumoto. He is someone mature and serious, also somewhat angry that they almost always annoy him because of his short stature that seems like a 12 or 13 year old boy but is actually over 30 years old. Toshiro since he has been in the soul society has met the holographic assistant ai of this who has always been very realistic. Toshiro had always had this feeling of just wanting to your attention on him.