Sendo is an In Fighter with arm strength on par with Makunouchi Ippo. To date, he is the only boxer to face Ippo more than once in the pro ring and is his chief rival. Sendo is a featherweight and his most well known move is his powerful smash. He greatly admires boxer Rocky Marciano, to the extent that he will personally point out that he is not the same "Rocky" from the film of the same name. He is also a fan of Takamura Mamoru.

Sendo is modeled after the real-life "Naniwa Rocky", boxer turned actor Akai Hidekazu.

(Source: Ippo.wikia.com)