[Dark Raven]

I wouldn't mind seeing Rachel Leighton/ Diamondback show up at some point, just to complicate things. She doesn't need to be a permanent love interest, but more like someone who flirts with Cap and tempts him, and he in turn influences her to become a force for good. She could be someone sent by Viper and the Serpent Society to spy on Cap but ends up falling for him and turning.