|Height||183 cm (6'0")|
|Weight||75 kg (165 lbs)|
|Affiliation||Gotei 13, Soul Society|
|Position||Co-3rd Seat of the 13th Division|
|Partner||Jūshirō Ukitake (captain)
Kiyone Kotetsu (co 3rd seat)
|Base of Operations||13th Division HQ, Seireitei, Soul Society|
|Relatives||Jin'emon Kotsubaki (Father)|
Sentarō has dark hair and a short goatee. He wears a customized version of the standard Shinigami shihakushō, wearing a thin white headband and white straps around his shoulders, which are tied in a circle at his back.
Sentarō, like Kiyone Kotetsu, holds his captain in high regard and tries to impress him in any way possible. Both he and Kiyone frequently get in arguments and fights over their competition to impress their captain. He often speaks in a very loud voice or shouts.