Suwa has medium-length, messy hair dyed blonde, shaved on the sides and back of his head, and black eyes with small pupils.
His unit's uniform is composed of an olive green jacket with black lines around the edges and white lines running through the sides of the arms and the middle of the collar. The uniform also includes headphones that he wears around his neck. He also wears a dark red shirt under his uniform, grey pants, a black belt on his left side with a dark grey pocket and dark grey boots with black spats.
Suwa is loud, with a bombastic personality that reacts in a big way to everything. When in combat, he seems to enjoy teasing opponents and riling them up, as he did with Enedra. He is almost always seen with a cigarette in his mouth.
Suwa and Tsutsumi have a good relationship.
Suwa and Sasamori have a good relationship. Sasamori hasa great deal of respect for Suwa.
He is mahjong buddies with those three.
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- (About his job) "First, the new models, and now a Black Trigger!? A man can't have a little rest 'round here?" 
- (About Reiji training Chika) "What!? But the difference in their height is so massive! What was that muscle brute even thinking!?" 
- He likes cigarettes, beer, meat, mahjong and mystery novels.
- According to World Trigger's Twitter, while he is in his trion body, he has a cigarette just to look cool.