Ehhh, to play along, I have to ignore the fact that I don't have favorite people that aren't already friends. I also have to give the caveat that my favorite characters are all mine.
But, I think I'd rather have the new friend than the new roommate. That's just in general, but I also can't imagine any of the characters on the list lasting as roommates. Being a roommate is a pain in the ass that most crimes adults can't tolerate for long.
But yeah, I think my favorite public figure would be a good friend. Mind you, it depends on exactly how limited the standard is. If we go living or dead, the person changes.
Edit: didn't know if you wanted the names. Living, it would be David Mack, a fairly well known artist that I've actually met a few times. Dead, it's Kurt Vonnegut
Bonus round, I'll take the enemy. Pretty much any characters I "hate", are hated because they're poorly written and thus ineffective. Caveat being that if I dislike a character enough, I'll just stop reading/watching whatever it is long before it turns to hate.
Edit for name: Sealy Booth. Yeah, he's an FBI agent on the show, but wtf is he going to do besides being snide at me? He's now an enemy, but I'm just a middle aged crippled fuck, not a serial killer