Reaching out for suggestions. There is a parade for the heroes and it appears people are calling out saying things like "I love you hero!", "Thank you hero!". One apparent bystander calls out, "「しぶいぞ、[side character]！"
I get that this can be "cool" or "stoic", but rather than just go for "you're so cool!" I figured I'd put out a request for suggestions. Can you think of anything more しぶい-like that doesn't sound silly?