Here are the animatronic characters (in the order they die)

Foxy as Ozzie

Bingo (the banana splits movie) as Gus

Spongebob as Knighty

Tom cat as Arty

Circus baby as Cammy

Bugs bunny as Willy

This Dot warner as Siren Sara

And Snorky as Tito turtle

the human characters

Enid (ok ko lets be hero's) as the janitor

Blossom (power puff girls) as liv

Unikitty and cyan  (just shapes and beats) as the couple

Circle (just shapes and beats) as the dude who died from knighty

Boyfriend as the dude who died from Cammy

Pico as the dude who got eaten by Siren and Tito

Cube as the girl who died from Willy

Blixer and master frown as the dudes who died from Siren