ahh thank you so much! sorry this reply is a bit late.

And it's not an irrelevant question at all! for mer!malik I'm just really bland and terrible -- I've always imagine him with a grey dolphin-ish tail, but I haven't given it much thought! A black tail would probably be better, ahah. But the only thing for sure is that he has gill slits over the sides of his neck and slightly webbed hands. :B