If you had superpowers...

[Exeres]

Then you would be all up in Tron.

If I had superpowers, I would be God.

[Vax]

Hero
Super Strength
Total Douche-bag.

[motorwaffle]

I'd take Colossus' powers.
I'd probably be an anti-hero due to my unwillingness to be evil and being to lazy to actively be good.

[Nancymaker]

Hero... And I'd like to have control over the earth, a la Terra from Teen Titans.

That, or the power to shapeshift.

[D-vid]

Complete Hypnotism. And neither hero nor villain. I would not need such labels I could make anyone do my bidding after all.

[Nefarious Bear]

what would happen if someone teleported to inside a wall or some other solid object?

Depends really

if the teleporter displaces or replaces whatever they teleport into then they will be cramped but able to teleport out as long as they don't suffocate

What would happen if it didnt displace whatever i teleported into

[Wordsmith]

My power would be to fire rabid sparrows out of my nostrils.plus invincibility and whatnot.
And I'd probably be a villain. My mind is too feeble to handle the responsibility that comes with such immense power.

Impossible.

Only mammals can get rabies.

[Avengifier]

My secondary superpower would be the ability to make up whatever slang I feel like and have everyone understand what it means. It would be like ojsppi on the szsko.