This addon added only two mobs/characters which is huggy wuggy and mommy long legs.

Huggy Wuggy:
health: 400
attack damage: 788
speed: normal
effect: blindness
now,this huggy wuggy can attack any mobs except for mommy, you know the spider, and note this huggy wuggy can't jumpscare you.

Mommy Long Legs:
health: 1600
speed: normal
attack damage: 987
effect: same as huggy wuggy
this is a spider lady that has long legs and it can stretch its whole body but in this addon it can only stretch its neck.

Disclaimer: This is an unofficial app for Minecraft Pocket Edition. This app is not affiliated in any way with Mojang AB. The name, brand and assets are the property of Mojang AB or its respectful owner.