1) L Lawliet
2) Matt even though he only appeared a few times in both the anime and the manga I still <3 him
3) MELLO!!!!!
4) Near
XD Awesome question :P
Near. Mello is a bit too hot-headed and rash. Sometimes his way of dealing with things is a bit too extreme. Near might not like to take action but at least when he does, he doesn't break too many pieces of the law along the way (but I dislike how he even used Mello to nab Light)
If I were cheering for the 'good guys' I would say Near, but since I wanted Light to win the battle of the mind the whole show I would have to say Mello 'cause he lost.
Near because he's calm and collected like L was. Mello kind of got on my nerves because he had so much potential, but since he was arrogant he ended up getting himself killed. I think it would've been more awesome if they had more scenes together.