Suggested by Sonic Jubilee is a pretty fun X-Men character and she’s a decent fighter. She even became a vampire at one point which did increase her abilities quite a bit. All that being said, she isn’t quite ready to deal with Loki. Loki’s magical abilities are pretty insane and with a single shot he could blast through her sparkles. Loki’s array of spells and abilities are pretty vast so he tends to have an answer for every situation. Loki wins.