Hi all,

I'm looking at House Umber Berserkers and realized that their kill effect is a passive ability - there's no bold text to imply that it's a triggered ability. Does it still count as a character ability for the purposes of i.e. The Red Viper?

Yes.

From the FAQ (page8, paragraph 3.6):

"Card abilities" (i.e. "Character ability,"
"Location ability," or "Attachment ability")
refers to anything in a card's text box, except
for traits, keywords, and flavor text. "Card
abilities" also refers to any abilities (again,
keywords and traits are excluded) gained by
card effects

Ah, excellent, thank you.