It's pretty obvious (I'm sure) that Echo is dominant in my head muse-wise, however I go through cycles with my characters where some days I feel Apollo really strongly, sometimes I feel Blues like nobody's business, Hymenaios has his moments, and sometimes Raven wants to play.
With my others, I've always loved the myth of Persephone so I'm sure that she'll become a big portion of my RPing if she goes over well enough. Lilibeth, Eleos, and Jezebel are more minor in my head but I enjoy their interactions with others too.