Are there any quotes to suggests what Mercutio looks like? The quote doesn't need to be said by himself but any quote in the play.
An interesting question. We know that Romeo says Mercutio has "dancing shoes," so we can assume he likes to dance and is physically active (and probably, therefore, lean). He makes a joke about being in the "pink of courtesy," which may mean his cheeks are rosy (that would reinforce the pun). Otherwise, no, we don't get any details about what this young nobleman looks like that I know of
"a visor for a visor" - Mercutio, Act 1 Scene 4
it means - an ugly mask for an ugly face