I always thought Bobbi's first appearance was in West Coast Avengers.
I knew she was a SHIELD agent but it appears she had a life before the Avengers I knew nothing about
1. She used to be a brunette (Astonishing Tales #6)
2. She used to have psychic powers (Astonishing Tales #6)
3. She was friends with Ka-Zar (Astonishing Tales #12)
4. She's a chemist (and apparently has a PHD...she was called Doctor in Astonishing Tales #12)
5. She helped design the stuff that turned Ted Sallis into Man-Thing
6. She used to be engaged to a SHIELD agent named Paul Allen
I can't believe I didn't know any of that until today.
Has she shown up since Secret Avengers volume 2? Towards the end of that "How To MA.I.M. a Mockingbird" arc, they revealed she was always a sleeper agent for Andrew Forson and AIM. I didn't come back for the newest volume to see if they followed up or resolved that.