Looks like autocorrect had a fun time here.
Personally I want the Mummy, but likelihood seems to fall on Max Brass for the rep. He's significantly more tied to ARMS than the Mummy is, as his design is... A mummy with arms from ARMS.
IMO all the other characters have equal chance, except Hex and the one villain woman with green hair whom I was so disinterested in that I never bothered to remember her name. Those two Nintendo and the community made a big deal out of, so they might have a better chance.