Lots of people including the main characters have powers, but some of the ones I can recall are: being able to turn back time, being able to hear people's thoughts, immortality, the ability to absorb and pass on other people's powers, immunity to other people's powers, invisibility, bending others to your will, being able to split into two identical 'yous', anyone who touches you wants to sleep with you and many more.
In that case it would depend if it were a power I'd have in real life or a power if I was living in the world of the show. For the former, I'd choose turning back time, for the latter, I'd choose immunity from other's powers.