...
i finally read through the thread.
i don't know what you can do with RPG Maker, so i'm just throwing suggestions. if you can do it, you can do it. if you can't, you can't.
suggestion on plot (if not too late): Doomsday thought to be a good guy, but he "hacked", so being sent to #hell (i think this is how it was?). how about near the end, Teta learns that #hell has corrupted Doomsday all these years, and you have to fight him to show him the light or something?
my character.
i use cards to fight. small cards levitate in front of my face, attacks and stuff come out of attacks. cards also fly around body, able to physically damage opponent.
hmm... so good guy or bad guy?
As a good guy:A NPC. as a MAT, i was kinda thinking of being a sort of "tester", to test the potential of Teta (going easy on Teta, of course). then, later in the game, i appear again, more powerful before, and challenges Teta again (with full power this time). maybe also test Rukarioman on the way, he beats me, i say he's good but he should be careful about the darkness in his heart or something?
As a bad guy:A NPC. i come across Rukarioman somewhat late in the game, where he has lost against Teta for the 69th time or something. i have a grudge against Teta because [insert reason here], so i offer Rukarioman these cards of darkness that will make him more powerful. and, assuming that Teta goes into #hell to rescue Doomsday, i'm a guardian boss or something? if not, i mislead Teta to an ambush or something. so i guess i'd be an underling of Dimka or whoever the main bad guy is.
sprites in spoilerbox.
SPOILERmy good guy sprite:

my bad guy sprites:

^ when i meet Rukarioman and/or Teta first time, when not in #hell
^ if i'm not a boss in #hell, this sprite throughout the game.

^ if i'm a boss in #hell
if voice acting needed, i'll do my own voice pl0x