Samhain

Samhain is the Ghost of Halloween. He will do whatever it takes to be set out to the world forever, by stopping time, blocking the sun, and making Halloween a 24/7/365 holiday. He has an army of Halloween spirits and monsters that do his every bidding with force, much like ghosts like Ghash and Wat.

Episode 38
Samhain arises from the darkness and makes everything dark and stuff. However, Eida Kokoro is like “hey, these guys hate light” so she, Slimer, and the ISA (Investigators of Spectral Activity) girls trap Samhain in light and he gets trapped.

Luminousity Comics (2020)
Samhain returns but the Kimyo Pretty Cure and the ESA (Examiners of Spectral Activity) stop him.

Luminosity Comics (2023)
Samhain shouts out “EVENING! EVENING!” to escape the jewelry box, but Phineas Evantide and Tarantula stop him before he gets the whole world.

Luminosity Comics (2029)
Samhain tries to break the barrier between the Halloween world and the human world, but Jack Skellington makes him implode by bragging.

Trivia

 * While Samhain pronounces his name “Sam Hain“ like he’s some sort of magician, it’s pronounced “Sawen”. That’s very important.