Q: What counts as a “special power” that might be impaired by an attaching Creeper?

any of these?
Card text (paragraphs)
Card title or name
Card Type (special symbols)
Doom/anti-doom hourglasses

A: The special powers referred to on Creepers that can be canceled out are found in the paragraphs describing any special actions or abilities related to having a given Keeper in play. There’s nothing special about a card being a Keeper, or about the name (there are no “names” of cards that give you any abilities are there?) Doom/anti-doom counters are also a separate concept, unaffected by Creepers: Doom is a quality, not an ability.