Looks like a proper bestiary for some the Arai-San Mansion abominations and abubu's other hell-zone story. Of course, the girl is teensy.

That is a damn impressive rendition of a griffon beast as well. You can put a stat block on that and it'd go right into your ttrpg.

Judging by its size and apparent resilience (note the embedded swords), pretty sure you could just slap a adult or ancient dragon's stat block on it and be good to go.

The behemoth appears to be the one from the movie adaptation of Stephen King's The Mist.

And then Jack Bright bribes the otters to drag 682 into Japari for funsies.

that decapitated serval head giving me NGE Lilith vibes

Wait. Which one was it that the Brain Tree appeared in?

The Behemoth looks like it's straight from Stephen King's Mist. Even the name is identical If I remember correctly. I don't know if we should tag it or if it's a coincidence.