Hmm there are a lot characters that I really like so this question is really hard. If I can only name one that it is probably Kratos form God of War. I really like the series and Kratos is simply awesome.
Favorite character? My logical answer is Kyle Hyde from Hotel Dusk. The dude was SO cool, I am a sucker for hard boiled detectives (IE **** Tracy [edit... YOU KNOW WHO I MEAN], Detective Miller from Leviathan Wakes, Jet from Cowboy Bebop, John Hartigan from Sin City).
Real answer is Doom Guy. A silent, tough as nails killing machine.
It's got to be Kingdom Hearts: Dream Drop Distance for me.
It's a bit slow & packed with tutorials as you start ... but it starts to pick up after a few hours into it. In fact, I crammed 30 hours in 2 weeks (with school in the way) before I got rid off this game for A Link Between Worlds (I traded it). I got to say the voice acting ain't half bad - I actually enjoyed it. The battle difficulty is spot-on for all sorts of players, and the Boss battles are terrifyingly brilliant and fighting was definitely a challenge (especially Ansem & Xenoheart) . However I must admit that I used some tricks to make fighting bosses more easier (cough Flowmotion cough). Overall I really enjoyed the game and I think it should be worth getting looked at by the 3DS community. First KH game and it made me a fan
The .hack games, especially the first four. Even without getting into the rest of the series I still think the games are understandable and enjoyable on their own and they've always been some of my favorites.