Akinator

[Luk3us 63]

http://en.akinator.com/

 

Give it a go, its actually kinda cool, I imagine its database at this point is pretty large.

 

I've beaten it a few times, though usally with obscure characters.

[Plok 327]

You can beat it by thinking of Oxanna from Tiberian Sun. Did it twice myself.

[AZ-Stalker 88]

This old thing? Hahahah, I remember when this was cool in my group of friends. Thanks for posting, almost forgot about it.

[Inferno 22]

I tried Umagon, but ended up with the Pyro

[TheBlackOut 7]

This site guessed Brian Peppers.. I'm impressed!