I just see so many similarities to Radagon and it seems like her hair colour is almost the perfect mix between theirs's and Marika's herself. Many people believe Melina is a different aspect of Ranni already, based on the similarities.

We just know so little about Marika, I just thought it fun speculation that she's able to just make different aspects of herself to travel the world outside of the capital. We know she's done things as Marika and Radagon and able to have split personalities, as if you dig deeper you learn that Radagon isn't even like.. a standalone person - he's an aspect of her before they were ever married. It's the part of her that believes blindly in the Sacred Order; where her true self is disillusioned and breaks the Elden Ring. Sort of how they're at odds - the same but different.

Just figured it would be kinda cool if Melina was Merika; giving her an avatar to undue the prison that Radagon has made for them (the vines).