I plan on adding this soon, I don't believe Versus CPU is fully implemented in Ikemen but I will put in some rudimentary single player modes like Arcade and Survival! I previously felt that there weren't really enough characters to justify making such modes readily available, although with some quick edits to data/bionicle/system.def in a text editor I believe you can enable them - no promises that it won't play Kung Fu Man's arcade cutscenes, I can't remember if I ever took those out, haha.