"Alive, but not organic." He doesn't mind the nosiness, apparently. Basic information about blades is common knowledge to him and there's no point hiding it just because it's new to the people here. (It's personal information he'll get cagey about.) "The majority of my body is solidified ether - you'd probably just call it 'magical energy.'"

Probably, since Murphy doesn't seem to have much ether around him, regardless of skin tone weirdness. (He's seen weirder blades, even if a lot of them are human-passing.)