Skin copy mechanic works only on licenced minecraft!
SIMPLE VOICE CHAT MOD REQUIRED (v2.5.20)

IMPOSTER
Is a filler horror mod, which meant not to be main scare factor and recommended to play with other horror mods. However it still can be pretty scary to play solo with.

STRONGLY RECOMMEND TO PLAY IN MULTIPLAYER
Mod add single but smart entity that will try to mimic your friend behaviour. It will copy random player skin and name and then begin to hunt down random player.

MECHANICS
To confuse you there are a few player-like mechanics
SPOILER NEXT
It can eat food, switch items, jump, do friendly squats, mine towards you, open doors trapdoors and fencegates, use ladders. Also now he can copy your voice!

If you have any suggestions leave them in comments!