Some of its Pokédex entries are innocent enough, noting it's "a Pokémon formed by the spirits of people and Pokémon," which isn't too sinister for a Ghost type ... tropes in its family friendly games.
This gave Ito a huge list to work with, given there are over 80 different ghost type Pokémon alone. After much deliberation, the two that he settled on were Gengar and Banette. The final result ...