Doppelganger

Doppelganger is a supporting character in "Let's Go Kaikigumi". Formerly a member of the supernatural group Kaikigumi, he possesses the powerful yet eerie ability to transform into any living human, which is said to curse and kill the impersonated individual upon seeing their duplicate. Despite his formidable power, he is exceptionally fragile-minded. After leaving the organization due to being rejected by the leader Mechako, he later tries to win her over by disguising himself as the protagonist. However, his trick is exposed, leading him to fly into a rage and attempt to attack Mechako, only to be effortlessly defeated. This devastating loss leaves him deeply traumatized, rendering him unable to transform out of a muddy sludge state, and he subsequently begrudges Shurako for constantly exploiting and mocking him.