Known bugs so far: I'll be editing as I go along.
Vagalion - Visible guns, and unable to switch to them to drop. When using the teleport ultimate that turns you completly invisible, the guns still remain. Solution? Restrict guns on that race, perhaps.
Rapscallion - Drops knife at start. If the gravity is messed up (still no idea what causes that), it disapears. Kind of annoying at the begining of a round but bareable.
Takeno Samurai General - Drops knife at start. Due to high invisibility, it's rather hard to find, or the gravity bug x2.
Necrons - Spamable ultimate. 150hp + 1600 cash, freezes nearby enemies, usable every 25 seconds. Once the 25 cooldown is up, if there is no one about to get frozen, the ultimate is spammable, resulting in server lag, and a player with 65k and probably 15k hp.