for a unique i think you shoud have 3 paths (Neutral,Good,Evil)
then 3 classes for each path
Neutral(Outlaw,rougue mage and Theif archer)
Good (Paladin,War Mage or Priest and Archer)
Evil (Demon, Deathmage or Satanist and Demonic Archer)
now when you pick classes you usually don't get to pick genders or customise yuor characters so that might bring an edge.
Outlaw-Normal person who survives everyday life by doing what they have to do equivelent to a paladin or Demonic knight
Rougue mage- someone who uses their magic spells to get what they want and have no regard for rules even their own equivalent to aDeath mage or War mage
and the others Vice versa
i think a good map is made up of
multiple levels like roof and celler
instaed of stages its all adventure
not too much of one skin or colour of level wall or floor
not too many powerups and make it do able even on hardest
edges
skills that usually x2 damge to your opponent for when they damage you
big bosses
own creation of music
envirment can kill player like swamps or pitfall traps
thats all i can think of