Yes, but is he fighing Callisto of the Morlocks or from Xena. I'm thinking the latter. Reason being Callisto of the Morlocks is an "average fighter" like you said.
Yeah, then demon from hell, then an angel or something. But I think Batman with his armored suit can win or atleast stalemate any of those uber versions.
k callisto knows every martial art style known to man- she herself said so. she has gotten a lot better than since she fought storm. cal said one of her mutant abilities is to be a natural born warrior. also she has more of a killing edge. combine with her heightened reaction time, strength, and her super senses and with those tentacles which give her like one hundred arms then i say she has a really good chance of winning.
Pressure points, nerve strikes, 127 martial arts styles mastered, etc.
I sincerely doubt that Callisto is a "master of all martial arts." I'll believe it when I see it. Not just because she said so. Especially with Claramont at the helm.
dude i dont give a hoot what anyone says she is not an avergae fighter she's very capable. and the whole storm thing. Storm is Uber powerful dude plus she was hopped up on some mind control thing while she beat her in the Arena. meaning she was working of base fighting instinct. but mans ooodles of gadgets might come in hand but i dont see what he could so about all those tentacles. and they are really strong too. not only that her forte is knives and shit soo what is he gonna do about all that?
Use his genius intellect. With gadgets, he wins rather easily. Without, it would take a while but with his genius and superior fighting skills he would eventually win.