Doomguy/Doom Slayer's name is B.J. Blazkowicz. He's the grandson of Commander Keen (whose real name is also William J Blazkowicz), and the great-great grandson of the B.J. Blazkowicz who was the Wolfenstein character.

Yes, all the ID software characters have the same name and are all related. They're also canonically Jewish and the family is from Milwaukee, WI.

According to an alleged John Carmack quote with an unknown source Doomguy is canonically a virgin because all he thinks about is shooting demons. He's also likely on the spectrum given his penchant for collecting figurines, preference for avoiding speech, and custom-tooling his weapons to extremes and, based on the way he dresses, probably gay

Doomguy moves a lot faster than Doom Slayer for one.

Doomguy is much more menacing because he’s just a guy who’s doing all the killing. But “Doom Slayer” is just some shit a middle schooler made up and the studio went with it. “Oooh look at me I am the epic demon slayer!!” No bitch. Finish your crayons. Sign that Space Camaro lease. Pretty sure it was semi-ironic at first, but then they just embraced it after fans had a boner

No mention of Blazkewicz?

Heresy!

I'm just not really fond of Doom Slayer, he was very edgy in the first reboot and while they do turn up a bit of cheese in Eternal, I just don't really care for him.

Not that Doomguy has much charm outside of supplemental material and fan content, but I still like him more.

Why not doomgal

Doom Slayer is the Walpurgisnacht of Doom Guy.

Time repeats, and we are caught in an Endless battle with Hell. Each time we try to stop the invasion. Each sequel some dumb corporation is harvesting Hell Energy. Each Can-It-Run-Doom integration we tear into the demonic hordes. Each reference causes a reinstall, to go to Hell one last time to close the source.

I like doomguy. He makes faces in hud.