The Sentinel fires a sexy pink beam from his mouth. I do not know the button combination to do this.
Your dragon as well as many of the enemies in the Panzer Dragoon series can fire a beam out of their mouths. I'm pretty sure mouth-laser technology was the cause for the fall of the ancient civilization.
While the appearance of the Bahamut summon has changed from game to game, he generally always fires a laser from his mouth.
Skagzilla fires a laser from his mouth as well!
Tortuga, the turtle boss, fires a devastating beam at our heroes.
One of the bosses in this game is a giant tomato that fires a beam at poor innocent Ronald.
Those Moai Easter Island Heads fire deadly mouth-lasers at your Vic Viper. Is that how the Easter Islanders died? Truly a terrible ancient technology!
Mother Brain shoots concentric blue energy rings out of her mouth. One of the few on this list to have both a mouth beam AND eye lasers.
Fortitudo can also blast lasers out of it's mouth. Okay, it might also be made of heavenly fire. He is also a giant dragon thing with an upside-down stone face for a body. For some reason, this seems completely natural in this game.
While technically a "Water-Jet Cutter" and not a focused beam of light, Metal Gear RAY certainly fires a beam out of it's "mouth".
