Also, re: the blood colors thing, Naruto is clearly bright candy red, and not hiding it. Hence why everyone and their mother in Konoha hates him at the start of the series. And also his Ninjassiah tendencies.

I torn between Sasuke being cerulean (Vriska's blood color) because that seems to be the "ocular mutations and psychic powers" highblood color, and his being indigo (Gamzee's color) because being incredibly fucked up in the head seems to as hereditary a trait for Uchihas as their bloodline limit.

Green seems to fit Sakura best, as it seems to be the troll equivalent of "middle-class", and the green-blooded trolls shown so far don't show any sign of unique abilities inherently tied to their blood color. (They have unique abilities, all right, but they seem to be acquired rather than inherent.)