A comedic nickname for main characters of video games so obscure, nobody really knows them outside of their cult following. Mostly used to refer to late-80s / early-90s platform game mascots like Gex, Bubsy the Bobcat, Awesome Possum and Super Mario.
Bob: "Hey man, did you see the new Smash Bros. reveal?"
John: "Yeah, they finally added Scrimblo Bimblo, the Lovable Scrunko!"
Bob: "Come on. Don't slander Banjo and Kazooie like that!"
A person who's an asshole,dickhead, or douche but is still pretty lovable because they aren't an asshole to the full extent nor a that one relentless shithead who's always giving you a hard time. A lot of sarcastic people are lovable asshole.