I'd be tossing up between the ability to stop time (my sleep schedule sucks. That's it that's my motivation. I want to sleep in with no consequences) or something I'll describe as Shapeshifting+.
Shapeshifting+ is basically shapeshifting but wetter and also applicable to others, if they so wish to partake in Rat Ear Day (or Blue Hair Day, or Turn Your Suspicious Skin Lesions Into Normal Skin Day, or Steal Danny Devito's Face Day, etc.)
The "if they so wish" part of the superpower is baked in to stop it from becoming a complete and utter nightmare.
Shapeshifting+ is basically shapeshifting but wetter and also applicable to others, if they so wish to partake in Rat Ear Day (or Blue Hair Day, or Turn Your Suspicious Skin Lesions Into Normal Skin Day, or Steal Danny Devito's Face Day, etc.)
The "if they so wish" part of the superpower is baked in to stop it from becoming a complete and utter nightmare.