Morpher: Based on the FFXI monstrosity system, it's build you own monster with form, abilities and traits. Could use Halatali as a monster arena for PVP and PVE fights.

Onion Knight: Is able to equip all gear, and all abilities, weaponskills, spells and traits from all your unlocked jobs. Build you own class and go nuts. Ofcourse it won't be balanced.
It would have two 3-combo strings where you slot in any WS you want. Additional effects and combo potency won't proc on first WS in the combo string, but will proc for 2 and 3. So if you wanted to have one combo string be self buff while the other is pure dmg, you could do that.