Allie (is super late, let me know if you want threads!) Arthur Curry is still pretty new here and not really sure how this world works, especially when it comes to their treatment of independent heroes. Still, he's in the water and off to Russia like a shot, ready to help out where he's needed.
Daisy Johnson is back in the field with Clint's team, and is helping Clint coordinate where she can. She's also got Mainframe support at the Lighthouse all set up with Babs and Jimmy so they can help, too. Eventually, she goes off with Dick and they run into someone very interesting.
Gamora is with Peter Quill and Drax on the Benatar and helping with search and rescure.
Harley Quinn is there with Clint's team, happily smashing bad guys with a baseball bat.
Hope Van Dyne would have gone with Team Science, but is also shrinking in and getting into tight places where others can't for search and rescue.
Kara Danvers along with her cousin, was one of the first people to arrive on the scene. She's helping where she can, and is also sticking especially close to the teen team. Though she knows they can handle themselves, and is giving them their space, she's basically there to provide official "adult" supervision.
Natasha Romanoff as this isn't an Avengers sanctioned mission, she's not involved officially. Though she'd love to be in the field, someone's gotta help Rhodey deal with the political side of it. She's at the Facility with Rhodey, helping him deal with the UN.
Regina Mills sat this one out, and is at New Asgard, but would have offered her services after to help heal anyone magically who might have sustained injuries.
Rey Skywalker Also sat this one out, but will offer any Force healing if needed.
Sabrina Spellman this isn't really her thing, but she would have teleported anyone who wanted to help out that didn't have a quick way there.
Stephanie Brown is there with the teen team. She's not a leader, but she's definitely there to offer Tim emotional support. She's never really been much of a team person, but she likes working with the other teens as a group. She missed hero work.
Wanda Maximoff officially, she's not there. Other world governments don't always look on her particular skillset too kindly, and she'd like to avoid any internal incidents. She's not drawing a lot of attention to herself, and will stick to mostly backing up her fellow heroes.