Got to go with the ability to mimic others superpowers...the best of all worlds.
What if no one else really has super powers? Then you'd be powerless!
Pretty much where I'm at, but I thought the question implied super powers existed.
Invisibility so I could watch you in the shower
to enter dreams and lead it where I choose
either mind reading or mind control or a power that includes both.
Be able to transform into anything or anyone.
The ability to turn matter into poo.
Always stay in control of myself ... under all circumstances!