Nemo

"Nemo, the wanderer of the seven seas, is afraid next to nothing. He spent most of his past life to find Captain  Noeye's treasue which turned out to be a simple paintball gun".

The code to unlock Nemo is "whalin".

Class: Shotgun     Max Damage: 216 - 240

Life Points: 135 HP  Clip Size: 3

Walk Speed: 19   Fire Rate: 1.2 Shot(s)

Strategy
As you can see, at point blank, Nemo can do up to 216 - 240 damage! Which means that you could kill a Gordon in 2 shots!

Use him towards snipers and other shotgunners, as he can wipe them out in about one shot.

For snipers, just zig-zag and kill.

For shotgunners, creep up on them while they are running, and when your at about point blank range, shoot, and the enemy shotgunner is dead.

Against
Nemo can be a pretty hard opponent to vanquish if ignored. For some people, sniping him might be a bit extreme, because some snipers have a habit of body-shooting.

You should use minigunners and rifles to kill nemo, as then again, keep your fire on him at all costs.