The 10th class will be Nerd. A cheap copy of the scout with thick rimmed glasses that fall down on occassion, khaki pants, and a polo shirt of either team's color. Weapon of choice will be one of the three writing utencils in his shirt pocket, organized from largest to smallest.
Or it may be the Gamer Nerd, complete with "waste bucket" from underneath his desk as his primary weapon.
Its probably gonna be a................................ (2 hours later)....................... Ah Yes! A zombie class or a Gordon Freeman class
Zombie class: Has 10000 Health and is meant to eat brains within' a second.
Gordon Freeman class: Use your might crowbar to kill them within' one hit. Can't reach em? use your wide vareity of weapons you pick up after your ally/enemies died.
Camper: Camp in one place with a Heavy turret gun that comes with heat seeking missiles and annoy other players with the ability to make the Heavy turret gun and laugh at them.