Second paragraph: gotta ask me stuff like that in a private medium or I won't answer, since there exist weird people who don't want to know unless I wrap up the information in a particular sort of package.

Third paragraph: Wolves imprint on people well-suited to pass on their wolf genes. There's nothing about power involved (Pera and Elspeth are the only witch imprints). It's arguable whether imprinting has "anything to do with" love. Certainly Jacob hadn't spoken a word to Elspeth before he imprinted on her and her personality was irrelevant to the process.

Fourth: No, no, he doesn't really have "wolf heritage" because Harry Clearwater got a genetic overhaul when he turned into a vampire, and all things considered I think I'd call Iseul the most boring hybrid in the world, but she's so dull you'll never even have reason to meet her.