The Doppelganger II for Minecraft

Spawn: appears naturally on the surface.

 Imperfect form

Disguise Lvl - Semi Perfect

Spawn: has a 3% chance of spawning from an original creeper.

 Imperfect form

Disguise Lvl -  Perfect

Spawn: has a 9% chance of spawning from an original skeleton.

Imperfect form

Damaged form

Disguise Lvl -  Perfect

Spawn: has a 1% chance of spawning when you go to sleep.

Imperfect form

Villager infected: spawn if a doppelganger Zombie kills a villager.

Disguise Lvl - Imperfect

Spawn:  if a minion villager manages to infect a golem.

 Imperfect form

Disguise Lvl - Semi Perfect

Spawn: appears naturally on the surface.

Imperfect form

Disguise Lvl - Semi Perfect

Spawn: has a 9% chance of spawning from a bat each time it takes damage.

Imperfect form

Minion: are summoned by the doppelganger bat.

Disguise Lvl - Perfect

Spawn: has an 8% chance of spawning each time you log into the world.

 Imperfect form

(Note: he walks alongside two llamas like the original.)

Disguise Lvl - Semi Perfect

Spawn: There is a 3% chance that a villager will transform into a doppelganger strawman at night and return to normal the next day.

 Imperfect form

Minion: has a 5% chance of being summoned by strawman.

(Note: minions will try to infect golems.) 

Disguise Lvl - Perfect

Spawn: spawns from a fake ore block that generates in the same layers as true ore blocks.

Imperfect form

(note: has variants for deep caves)

Disguise Lvl - Semi Perfect

Spawn: generates naturally in the world

(Note: Here you find stomach blocks, when broken they drop rotten flesh, bones and iron nuggets.)

Minions: appear during the day to feed the false desert, they have specific targets such as husks, animals and players.

Minion Husk

Desert Mouth

(note: hordes of husks appear during the desert's hibernation state, at night)

Night

Day