Ghost

Ghosts are immortal entities that originated from mythologies, but ever since they were brought to real world (evolution world), humans, dylanuses, and other sapient species that die will live forever as ghosts. Fortunately, all ghosts are harmless and they don't even try to scare people, unlike in pop culture movies and series. Ghosts are actually very peaceful entities that won't effect any living beings. Since they're immortal, they don't need to feed, drink, sleep, etc. Unlike in myths, they don't disappear/vanish completely in sunlight nor they stay the same place for the rest of their lives, so they won't be restricted to the place where they died.