Clint: Will have dropped Lila off with Rogue and co. so she's safe while he runs off to help fight the Chitauri.
James: Will also be out fighting with both his physical and energy shield and doing Steve and Natasha proud.
Cade: Is rather grateful these aren't Decepticons. But he's got his transforming sword so he'll help wherever he can.
Diana: Is showing off her badassery in fighting the Parademons even if she doesn't know what they are. Once they're done for if any of the demigods playmates are around she'll go off and help them out.
Jason: Is all morphed up and is kicking ass against the putties.