This owns petz :P
I have a few ideas:
Spells for classes (Maybe spellbooks?)
Items which only certain classes /r aces can use
Monsters which you can fight (Also drop items / money)
An easier AdminCP interface (i know its easy, but everything takes long

)
Random Events (Money/Items/Exp/Levels)
Instead of just "Buff" on items, you could have Attack, Defense, Evasion, Speed, Magic power (I know you have them on classes, but items would be cool)
A place to hang out (A clan house / house where people can hang out and chat and maybe have a shoutbox?)
User Shops (Users can buy / sell what they want)
Summoning Monsters (For use with the monsters you can fight, you get a scroll / book which lets you summon a monster which aids you in battle)
Pets (Character can gain pets to aid them in battle, but once they die, thers no coming back)
New types of weapons (Helmets, Gloves etc) with their own specifications, like speed agility, instead of having them as armour / weapons.
Weapons with special abililites such as stealing HP / MA
Spells which add more defense to you?
Items which require spells to be used, such as poisoning(with a poison item), etc
Ability to trap an enemy in combat for 2 turns
Admin configurable events, to double exp (againsed monsters only) for a certain time (hours, mins etc)
Ability to make items using ingerdients / materials (such as timber, steel, poison ingredients which are gainable from defeating monsters / random events)
More ideas soon!!