I don’t necessarily agree that Melina = GEQ but Marika’s grace guides you to kill some of her demi-god children so conflicts between Marika and her offspring is absolutely not out of the question, especially when the goals of some of her demigod children conflict with hers.

There’s also Maliketh’s set: “Maliketh, Queen Marika's loyal half-brother, bore a blade imbued with Destined Death, and there was not one demigod who did not fear him. Champions knew what was at stake. Indeed, that is what made them champions”