In AGoT, another of Mr. Lang's famed LCG design, the traits 'ally' for characters and 'condition' for attachments seem to be negative. The drawback of a negative trait seem to sometimes allow for a card to be costed generously by R&D. In light of this, Invasion's cavalry trait can be seen as a negative trait. Well...is it? There are certainly no cards as of yet in Invasion that interact with a trait to make it negative. How 'bout other possible negative trait? Is initiate one? Any suggestions/comments?

Right now, we don't have any "bad trait" (I clearly understand what you mean cause I'm an Agot player too and I've been a CoC one).

I guess we'll get some "bad traits". I can see a condition like "non-Hero" or maybe something with the most common trait (maybe "Warrior").

Hero. It has no advantage and a drawback, and is used to balance powerful Units.