Lot's Mo' mobs (More) Not by original creator)

Hostile
Lich: The lich is an undead mob that carries a wizards staff and wears chainmail armor. This staff can smite all mobs except undead mobs. The Lich can detect you from 150 blocks away (100 more than the zombie). The Lich is often found leading hordes of zombies and skeletons. Liches naturally spawn in desert temples, jungle temples, on beaches near ocean monuments or within a 10 block radius of bone blocks or dropped bone items. Although liches wear chainmail armor they burn in sunlight.

Wraith: the wraith is a 2 block tall undead mob. The wraith has a skeleton body with no legs and a red glow, they wear Robes (like capes but covering sides of the body). Wraiths usually float 1 block above the ground but can fly up to 5 blocks above the ground to get over obstacles, wraiths are the only mob (apart from boss mobs) that can kill Ghosts. Wraiths remove 2 hearts with each hit but die during day. They have 15 health.

Passive
Ghost: The ghost is almost completely opaque during night but at day almost impossible to find. The ghost will spawn around you when some one who has slept in your house had recently died or when you have the nausea effect. Ghosts scare other undead mobs away from you if you have three or less hearts. Ghosts follow you but avoid swords, sunlight and going close to players. The ghost has the skin of the last player who died on your server or game and sometimes wear robes (Same robes wraiths wear).