John jumpscares
Noah damages you when hiding
G-Glitch is A-80 but no damage
Mario is also John
X variants are harder variants of the entities they're based off of
XX variants are even more annoying
Minions do stuff
a-10 is rush 2.0
a-35 is -10 but faster and will kill you 2x
a-60 is a-10 but even faster and waits at the start
a-80 is a-246 but doesn't rebound and isn't one-shot
troll-90 (April Fool's) is a-90 from doors but troll
a-100 is a-35 but checks grey lockers and is faster than a-60
A-120 spawns M-120s and rebounds 2 or 3 times
A-150 spawns in the middle and checks lockers but not blue ones
A-183 is a-35 but breaks the sound barrier and returns 4-6 times
A-200 is a-80 but one-shot and will come back when you get out of hiding before it despawns
A-220 (April) is A-221 but more annoying
A-221 (removed) is A-183 but superbuffed
A-245 breaks lockers
A-246 (removed) is A-200 but rebounds without you getting out. Twice.
A-247 (April) is A-246 but more annoying
A-258 screams
A-278 is A-80 but spawns minions AND one-shots
Tlab-278 checks tables
Ulb-278 checks blue lockers
Billy is A-278 in April 1st
Purple Billy is ULB-278 but in April 1st
Sad Billy is Ohio TLAB-278
Bully Billy is Noah but will damage you no matter what
A-300 spawns any of the ones listed above (except for 278)
A-332 is A-200 on steroids mixed with A-10
A-350 shoots orbs and bricks at you while moving in far steps