He is a sumo wrestler from Eigadai Affiliated High School. He is the son of the last Japanese yokozuna, Yamatokuni. He won the the title of High School Yokozuna during individual bouts in his first year. Upon entering his father's stable he took the shikona of Kusanagi Sousuke. He holds the rank of Ozeki, and has yet to win a yusho. 

It is a divine ritual, a martial art, a combat sport—it's sumo!! 

A "small" new student, Ushio Hinomaru, appears before the weak little sumo club of Oodachi High School! The words "big" and "heavy" are the rules to this sport, which does not fit this newbie any inch, but this guy goes and does what...!? Ushio and the small sumo club climbs its way to the top! 

The goal is Hinoshita Kaisan (A title for the highest rank in professional sumo, equivalent of Yokozuna)! 

A fired up high school sumo tale—no retakes allowed!! 

(Source: MangaHelpers)

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He's part of a music unit called AMADEUS under the name "Jack Westwood".

On September 5, 2022, it was announced that he married the filmmaker and director Misato Kato.  

__Non-anime roles:__
- Dr. Ratio - Honkai: Star Rail (VG)

He is the son of Mark and Carol Sinclair and the brother of Lauren and Graham Sinclair.

__Awards:__
- Voice Actor of the Year at 2nd Annual BTVA Anime Dub Awards (People's Choice)

The weak sumo club of Odachi High School welcomes a new "small" member, Hinomaru Ushio. Everyone thinks he's too small for this sport, where having a "big" and "heavy" body is crucial, until they reveal his past! The goal is to become a yokozuna, the highest rank in sumo wrestling. Fired up high school sumo begins now!
 
(Source: Manga Plus)
 
Note: Includes 1 bonus chapter.

Sousuke Kuze