[Well, he's glad the boy's comfortable having blue hair. Always good to be comfortable in one's own skin. And hair, however absurdly colored.

He hums in a thoughtful manner best interpreted as a 'yes, though not in a bothersome way. In fact, I find it intriguing.']

It is certainly remarkable, but that is not such a bad thing, I think! Particularly not in a world that seems to struggle with color.