

Define “long.” I disagree with the Doomguy proposal explicitly, because Doom appeared on the Sega 32x in November of 1994 which was barely a year after the initial PC release. One of the defining aspects of gaming in the mid '90s was the monumentally cynical gold rush of trying to cram Doom onto any damn fool console as fast as possible, in a vain attempt to capture part of the lightning and make those sales. And until the Playstation and arguably the N64, every attempt failed spectacularly in various ways.
The definitive Doom experience remaining locked to the PC for those few years was absolutely not for a lack of trying. Every greedy video game exec on the planet wanted Doom on their system. id themselves assisted with several of these ports in various ways and they had absolutely no intention of leaving Doom only on PC, either, if they could help it.
Pretty much all of those are characters from franchises that quickly jumped to consoles, or had the intention of multiplatform releases from the very start. I’m not sure any of them are very fitting.
So on that note, the least nonsensical mascot for PC gaming in particular I can think of is that dwarf, whoever he is, from the box art of World of Warcraft. Or possibly the orc from the alternate version. WoW is earth-shatteringly popular and has basically defined the entire private lives of a depressing number of people, not to mention it’s the sole and singular thing even non-gamers think of when you mention MMORPGs. And it has only appeared on home computers. Never consoles. Other Warcraft properties have, but not WoW.