They're Everywhere!
Way back then, it was big news that a comic book character joined or quit a team, and they were loyal in that they only served on one team at a time! But these days, there seems to be a lot of characters who are on multiple teams these days and I felt obligated to try and list 'em all. These guys and girls serve on more than one group and it has be simultaneously with another. Feel free to suggest anyone who fits that I may have missed!