Did I ever had the chance to mimic Xi before? And what power do I know he can do (not sure I remember them...) If I have a doubt I could have a serious backlash from him, I'll mimic Jackal as stated. If I have no clue or I know I can mimic him, I'll mimic powers, skill and feats.
And I may be out of town this week-end, so you can put me on auto-mode for the next few days if you see me slow. Just put Kevin as cautious, trying to get some easy power if the chance occur, if not, let him attack with his sword.