Level 22 Assassin
If I could go back and change my class, I would. In the first game, Mordacai, or the "assassin" was fucking badass because of Bloodwing, you could just send it out and it would fuck shit up.
Zer0 does not have a special like that, and while his special is dope, it only works on one target and then you are usually standing right beside an enemy and get fucked up, unless you use it for critical headshots.
The game is still funny as fuck and really fun to play