Its actual appearance is unknown. A scholar who saw what was under its rag was overwhelmed by terror and died from the shock.
Biology[]
(From Bulbapedia)Mimikyu is a small Pokémon whose body is almost entirely hidden under a rag. Its beady black eyes are visible through holes in the body of its disguise, and the fringe of an amorphous foot or lower body appears to be visible under the hem of its rag. Occasionally, it will also extend a black appendage from under its rag. The veil itself resembles a Pikachu. The cloth is yellow with black tipped ears. The Pikachu face appears to be drawn with crayons, consisting of black eyes, red cheeks, and a squiggly black mouth. Mimikyu also carries a small stick resembling a lightning bolt to create a tail for its costume. When its disguise is damaged, the costume's head droops limply backwards, revealing Mimikyu's ruse. Larger rips in the costume are accompanied by shadowy vapors pouring out from whatever is hidden within.
A lonely Pokémon, Mimikyu is always covered by its disguise. Since this Pokémon is weakened by sunlight, it is rumored that the veil is used for protection. It is believed that seeing its true form will cause a mysterious illness or even a painful death. Mimikyu's disguise is modeled after Pikachu because of the popularity of Pikachu-styled merchandise, thinking that its disguise would allow it to make friends with people. If its rag is damaged or its neck is broken, it spends all night patching it, and seeks revenge on the one that damaged it, fearing that its true identity could have been exposed. Mimikyu finds repairing its neck difficult, often causing it to cry inside. Mimikyu is the only known Pokémon capable of learning the Z-Move Let's Snuggle Forever.
If Foresight or Odor Sleuth is used by an opponent, or the opponent has Scrappy, the effectiveness of Normal-type moves is 1× and the effectiveness of Fighting-type moves is ½×.
(From Bulbapedia) Mimikyu's disguise is based on Pikachu. The execution of the disguise is similar to ghost costumes made from bedsheets. Mimikyu also shares similarities with the Bugul Noz, a Breton myth about a kind and gentle fairy spirit whose horrifying ugliness causes it to be perpetually alone.
Name origin[]
(From Bulbapedia) Mimikyu and Mimikkyu may be derived from mimic and Q, you, or きゅうきゅう kyūkyū (onomatopoeia for squeaking, similar to Pikachu).