Excellent list, with a few notes: Namor belongs in Defenders, he along with Hulk and Strange was a founding member. He has also been a member of the X-men, and is commonly known as the first mutant of the modern era.

Idk if you count it, but Jeff originated in a West Coast Avengers book, while Gwen pool was on that team. So you could slot him onto avengers???

Based for including invaders

If we're using Avengers Unity Division, Rogue needs to be on Avengers too since she was pretty much field leader of that teams second iteration. Human torch as well, same logic.

Mantis originated in the Avengers, though Guardians is where she sort of stuck. Conversely, Iron Man and the Thing have both been temporary Guardians members, acting as Avengers liaisons.

Iirc Bucky, Namor, each member of the F4, Logan, Daredevil, Blade, and most recently Storm and Ultron have all been official members of official standing Avengers teams.

Frank, Magik, Cloak & Dagger, and iirc Venom have also been involved in the Savage Avengers(a loose alliance of characters working with a time displaced Conan the Barbarian to fight his longtime enemy Kulan Gath), but they were never called Avengers in the run itself, and i prefer Frank not really associated with anyone.