>>43712035Dark is "edginess: the type". If it's in any way evil or sinister, it's Dark. Criminals, thieves, demons, and sinister forms of magic (often involving literal darkness), all fall under Dark.
>>43712563Fairy isn't about myths and folklore at all. It's really closer to being the opposite of Dark, being the kindhearted/altruism type. There are a couple weird outsiders (such as the tapus, who I honestly think would be better as Dark types), but every type has its misfits (such as Altaria being Dragon).