Buster the rat

Buster is a fictional animal featured in comic books published by Marvel Comics. He is part of the mainstream Marvel Universe and first appeared in Black Panther, Volume 3 #1 in November, 1998.

Biography
"Buster" was an ordinary rat that occupied space at the Leslie N. Hill Housing Project in the New Lots area of Brooklyn. He frequently appeared in a room being used by U.S. State Department official, Everett K. Ross. Something about the rat bothered Everett, who took to calling him Buster as in, "Busta My Chops". When Buster entered the bathroom, Everett sat atop the toilet in his underwear leveling his gun at him.