The Enhancement Editor is an NPC that lets you change the appearance of your Enhancement, to any stage, as long as you've unlocked it. However, it does not change the buffs of your current Enhancement stage. It's appearance resembles mygame43's Roblox avatar.
There are three enhancement editors, each in every sea. [demonstration video]
Located at the "Set Spawn Point" NPC, close to the big castle where Don Swan spawns.
Located in the Castle on the Sea.