You spend your life as the trigger of a gun named Chrono. During the prologue scenes, you play interactive cutscenes where your manufacturers are building and testing you. Finally, when you enter your adult years, you're put into military service to go kill some terrorists into the hands of a battle-hardened warrior and your best friend. Eventually, that man defects and the military orders you to hunt down and assassinate him...but it turns out that your friend really hadn't defected, but was instead sent on a top-secret mission by the military to pretend to defect and Chrono having to kill him was all part of the plan. Depressed, Chrono feels duped and used by the government he was loyal to and leaves it to pursue his own goals.
He creates his own private military company which he dubs the "Déclencheurs Sans Frontières" where triggers around the world can live free from the oppressive ways of the government. However, Chrono loses his way and you spend the rest of the game terrorizing cities and kidnapping child soldiers, until finally on his death bed, Chrono realizes all the terrible things he's done and dismantles himself right back in the facility that made him.
It's a third person shooter.
Crash Bandicoot