I quite like Mel's relationship with Hecate, they clearly care a lot about each other, but there's still a sadness to it.
Mel and Chronos can both cheat death. They're both immortals to begin with but Mel has a recall spell that triggers when she dies and Chronos has time magic that enhances his existing regeneration and both sides are looking for a way to break the stalemate and put the other down for good.