The funny thing is none of these are red. They actually had to resort to werewolves and vampires bleeding into red. That's when you know red is fucked.
I dunno. Werewolfs are pretty much unbridled fury. Seems red enough. And my favorite vampires are the BW type - aristocratic, but evil, but the ones is like 30 Days of Night seem redish. But yeah, none of them could really be strictly red in the sense you're talking about.
I think they did really well with the tribes.
RG - Werewolves (fury+nature)
UB - Zombies (regular and Frankensteiny types)
RB - Vampires (see above)
UW - Ghosts (this one seems the weakest. What is blue about a ghost? Flying, basically)
RW - Humans (White stereotype and red for being pissed off at being eaten)
I wonder if they're going to move into other colors with different monster tropes? And if so, how would they avoid the Ravnica guild feel?
UG -
UR -
BW -
WG -
etc cause I'm too lazy to think of all the ones I've missed
They also had devils in red.
Oh yeah. Huh.