Team Fortress 2
The Spy is a French man. His main asset is stealth. He has a watch which makes him invisible for short periods of time, and a cigarette case with disguises in it. He can disguise as any member of the other team to trick them into not hurting him. This disguise also tricks Sentry Guns built by Engineers. However, there are ways to find and kill spies, commonly called "spy-checks". The Spy can also place 'sappers' on enemy buildings, hurting them and turning them off until an Engineer can remove the sapper. For fighting, he has a revolver and a knife. The knife allows the Spy to kill an enemy instantly if he stabs them in the back. He is useful for killing Medics, Heavies, Engineers, and Snipers. The Pyro is able to easily stop him, as even when he turns invisible or is disguised, players can still see the fire on him. The Spy is considered a "pick class", meaning he is very dispensable but also very useful to get certain kills.