Opinions on Evan

(this may be tricky, they'd probably have to make it so that the player takes any damage the dragon takes as well)

Give the dragon it's own HP and MP and own potions bag to hold potions. Set what % of HP and MP various potions go off at, almost like a pet.
Give room for, iunno, 10 slots for potions until it runs out. Enough that it could boss without too much trouble, but a small enough amount that it wouldn't become a mule. So Nexon is happy, throw in an expansion for the slots in the CS.
If the dragon dies, there could be some basic (and weak) spells that the player alone could use. Put a cooldown before it respawns, or require certain items?
Or just warp you to down. "TAKE KARE OF YER DRAGON!"