I have an idea that takes the Avengers prompt one step further. I want to base this team on the Avengers but flip the genders of the team and shove in some JLA references. (By the way, could we use "The Guardians" as a team name? That would be a nice hat tip.)
Anyway, my proposed team:
a female archer
a female brick
a goddess (with a shield) *
a woman with power armor
a non-powered male superagent**
*This one will do triple duty: inspired by Captain America and Thor, with a dash of Wonder Woman
**Inspired by Black Widow, but with a dash of Nightwing/Batman