I think you should go with a class system, in the menu, you should have mage, warrior and ranger, and it should affect the price, or effectiveness of skills, and some other things, ranger will deal more damage with ranged weapons and upgrading damage and walk speed is better, warrior deals more damage with melee weapons, and upgrades swing force and health better, and mage deals more damage with runes and upgrades stamina regen, and stamina better. also, maybe each class has a special ability, like warriors having passive damage resistance, archers turning invisible when below 25% health, and mages having a spell casting familiar that can be equipped with runes but the spells do 50% damage and the stamina pool is half the size of the characters.