User is.... made of ice-cream

Pros:
-user can regenerate lost body by eating ice-cream ingredients
-user can eat anything and change the flavour of their body
-user can change form when needed

Cons:
-user is made of stuff that melts
-user can only eat ice-cream ingredients
-user must be in an isolated suit to prevent melting
-user can not go out in the sun
-don't ask about organs
-user won't have working eyes if unlucky

Weakness: heat, any heat
User will melt and find it painful as they can't regenerate when in distress

(Don't ask what flavour they are that's weird)