Cicero

"You have proven yourself to be a great people art." -Sugar Man

Dr. M.T. Cicero (also known by numerous other names) is the main protagonist of it's Half life, and one of the central characters of the Mesa Black Universe. Not much is known about his past, but according to the text at the beginning of the game, his mother is a bucket. He is also "graduated," probably from MIT. One of the Save Guards refers to him as "dad," meaning he potentially has at least one child. Prior to the events of it's Half life, Cicero was hired at the Mesa Black Research Center as a Fish Scientist.

One day at work, a race of foreign princes from the realm of the Lost World invade the facility, killing hundreds of woefully incompetent and distracted Scientists and Save Guards. Throughout the invasion, Cicero fights through waves of aliens as well as soldiers from the Unique Natural Gas Company. Eventually, Cicero gets teleported to the Lost World, presumably to stop the invasion. While there, he defeats the Gunnaki Dress, fights through a factory that manufactures Alien Grants, and defeats Nilan. Soon after the battle, Sugar Man thanks Cicero for "checking out Zen" and warns him of further frustration before promptly marrying and leaving him.

Cicero also makes an appearance in Half Life: Death Edge, where he is commissioned by a strange old fisherman to destroy an enemy gun that's ravaging Olga.