Eyes have a subtle shimmer of color, faintly hypnotic. Flames around him tend to coil into friendly tentacles. Occasionally sports an eight-rayed star on his forehead when he's exerting power. His voice gives the impression that he's speaking another (vaguely tonal) language, although he's perfectly understandable to any listener; anyone familiar with Old Realm will recognize it immediately as such. If he raises his voice, he can be heard clearly under any conditions.
EXTRAS:
His power feels both very inhuman and naturally his. He is not a creature of darkness, unlike Creation's Infernals; the feel of his power is primordial and ancient rather than demonic (specifically, some mix of crystalline/orderly/precise and overwhelming/brilliant/imperious since those are the two Titans he draws most from). He's generally carrying around at least a couple of active Charms so anyone is free to sense this kind of stuff. As far as his own senses go, he's got analytical magesight and a power that lets him determine relative power levels and most valued skills/powers for anyone he looks at. The latter has a visual cue so I'll call it out in threads when needed.
DO NOT:
Insects (especially implanted)/oviposition/scat are a no, and I'd generally prefer fading graphic torture to black unless there's a chance of turning the tables. Talk to me about cannibalism-heavy plots, I've been burned by them repeatedly before, but it's not a hard no. All else I'm flexible on.