They can have different Athena etc armors, however Helios would be too OP cause every weapon would have the ability to mark people, plus you'd have a 2nd hammer and Maul, I don't even know what magic it could do, (besides one that just does mark explosion). Athena would be an OP healer, maul could've Demigod form like Hades etc cept it heals teammates near you with each hit you do. They CAN make them work but based on what we've seen from them already, they'd be too OP. Can't we have the Furies instead so we can punish people who betray their gods and constantly switch allegiances?
I love Leia, especially the way she extends my staff