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