Outtrigger

Outtrigger is a first/third person shoot-'em-up game originally released for Sega NAOMI arcade hardware before being ported to the Sega Dreamcast. It is compatible with the Dreamcast Mouse, and in Japan, came bundled with one.

Developed by Sega AM2 and produced by Yu Suzuki, the game featured four unique characters, each with their own class and abilities. This makes it the first hero shooter.