Other people who probably get taken out quickly:
King Kong is massive, loud, and an obvious threat that'll likely get double or triple-teamed. If The Good Hunter doesn't pulp him the same way he pulped Cleric Beast, he goes down fighting Blossom (who sees him as a threat to the city, superhero genre mindset, etc.) or the Manticore, who can do everything he can except also more things- summoning, sleep, poison, ranged attacks... (in fact, these summons are probably what The Good Hunter would spend time cleaning up in character. That's what Hunters do, after all, hunt beasts.)
Knack is similar, being building-sized, but probably trickier to deal with given his Regenerationn and elemental attacks. He might deal with one before, say, being incapacitated/soul-shredded by Sans.
The Survivor, versatile as s/he is, seems pretty sorely outclassed as far practical AP/Durability and fighting skill, as well as hax resist (i.e. s/he's a pretty likely target for Sans to telekinesis/obliterate, given their fairly extensive presence on the battlefield + his able to counter their skill set with teleport/spatial manipulation spam.) Probably doesn't last long even assuming s/he hides, though like Knack his turrets, traps, pets and whatnot might pick up a kill first.
Blossom is... a small child. She'll be immature and impetuous, and an unsubtle threat with her superpowers, and she lacks the hax resistance to back that sort of mentality up. Goes down before long.
I love Midoriya, but on top of lacking hax resistance and versatility beyond punching people, some of his stronger attacks overload his own body. I don't see the kid making it far in a situation as chaotic as this.
Aztec Rave Monkey is not only giant, it's also indestructible (to these guys, anyways.) That said, it seems to have nothing special as far as offense goes, and also appears to be baseline Building level. Other than being a pretty hard counter to The Hunter, who probably would just bang his head against the proverbial wall trying in vain to scratch or mind hax it, it doesn't really have much going for it- certainly nothing stopping Liliana from astral poking him/Sans from soul-shredding.
Gon runs into the same problems as Midoriya.
The Ur-Didact is one of the most threatening here, certainly, with his TK grip and Large Building+ durability making him a veritable tank, but this is what would get him into trouble... the obvious threat that he is, Liliana would probably make attacking his astral self Priority Number One very quickly into the royale, let alone once he starts targeting her. And since he doesn't really have much that can stop that, well, it would just come down to who's hax can snuff the other out first I'd imagine.
That's... about all I've got, right now.