If I remember, he's 100% woman due to magic and his bra anatomy-wise, but he's still refers himself as male. So its a newhalf by origin, but futanari technically.
theres a bend in the strip of fabric hanging down in front of his/her/its panties that lines up with the bulge, at least from how I see it. flacid penis, maybe?
As far I remember Flea is a male, Im not gonna get in details since this could easily turn into another "utawarerumono twins uber discussion" post, but Im deleting "Futanari" since you cant have both (trap and that one I mean)