Do you play GTA V at all? 
Is that Grand Theft Auto?
Yes the game made by Rockstar! 
No I have never played it, is it available only on game consoles?
Your really missing it out you should play it! It's available on all consoles and PC of course!
Do you get to pick your character or does the system pick it for you?
Well if you play online with other people then yes you can create your own character and do anything you like. But if you do the story mode you play as three different characters, Franklin, Michael and Trevor! 
which one do you prefer to play?
I love to play the story and play as Franklin that's my fav thing to do! 
Is he a good guy or a bad guy