I feel like Cass and Donna should be involved in Diana's life and should have some kind of solid baseline status quo before we bring in more legacies and sidekicks. When those two aren't really tied to Diana and Donna is still comics' biggest train wreck I feel like a third legacy is the wrong thing to be putting effort into.
Don't care what the origin or powerset is as long as its well written. Don't really care if he's queer.