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He probably drank Demon Blood too.
Wondered that myself actually. His eyes are kinda suspicious, so there might be something hidden. Though of course it could also hint at his powers.
I thought he might have drank demon blood as well. But the Armored Giant case makes you think it's really difficult to control the demonic power when mixed with strong people (it's why they resorted to only giving to apprentices).
Or he probably drank demon blood, and I guess he didn't lose himself, and the eyes are a side-effect of the perfected state.
IMO he just has those eyes for for aesthetics, and if not, I doubt it's from the demon blood.