I'm wondering if he abandoned his playthrough. It wouldn't surprise me, considering how everyone and their extended family seems to be doing one right now, but I'm still sort of disappointed.

As for what I think of him? He strikes me as a genuinely good person, but tends to come across as annoying during a lot of his playthroughs. Lots of yelling, annoying noises, recurring irksome phrases. Not sure how well I'd get along with him, honestly, but his heart seems to be in the right place and that's enough for me.

This actually sounds like it could be an actual Undertale character. (Minus the Markiplier, of course.)

Like, he's a mildly irritating Let's Player with a bizarre name like xX_monstahkill420_Xx, who is fairly popular on the monster internet. When you fight him, he narrates the entire battle, yelling incoherently and spouting catchphrases.