I'll wouldn't see this as a logo, maybe like an imagen the client can use on his post, or and illustration, but not directly to asociate with a person, and have Copyright attachet to the original character your mencioned.
But this is, for sure, a really great illustration, based in an ispirating character, not a logo... in my opinion.
Still Upvote, for the great work !
Thanks! yes I think it's probably better to call it a footer, because it is definitely supposed to be used at the bottom of his posts.