If I could have any superhero power it would be immortality. Despite the fact flying, teleportation, shape shifting etc would be super cool - I genuinely would rather my life would never end. It would be so amazing to see the world change over so many years and experience that. Also my biggest fear is death. I can't be 100% certain there is an afterlife and that scares me very much.
Of course there is a downside to living forever... Seeing everybody you care about die while you live on... But I guess over time you learn to not get attached to people. Use the benefit of not being able to get killed to save lives, take bullets, rescue people.
But hey that's just me! What would you choose and why? I love asking people this question! I get so curios of people's answers! π