I imagine Chuuya is very lean and muscular but still on the smaller side and not super buff/bulky since his main fighting advantage is being fast and nimble!! He has very strong and toned legs since he utilizes them most for fighting, and a very plump round ass ofc lol. Also small waist and narrow hips. His arms are still toned but relatively slender since most of his strength is in his legs. And I think chubby Chuuya is cute especially fem chubby Chuuya!