If you could create your own Duo or Harmonic Hero, which characters would you like to see together?

Lead unit, backpack unit, theme, weapon type, movement type. Let your creativity flow.

Well, I'd give you a Nemesis Duo/Harmonic Hero as my example, but I can't think of another character to pair him up with. And Ivy already has a Harmonic alt and I also couldn't think of another alt for her as a Duo/Harmonic hero (maybe with Hortensia, but I don't know a theme and I want to give a good example)

So my example would be a Duo hero with Eir as the Lead and Fjorm as the backpack. My 2 favorite free book OCs, I think they can have an interesting interaction together. I can see them in a Winter themed banner (I think this can work). Eir of course should be either Flying or Cavalry, otherwise it would feel wrong if not. She could also be a dagger unit as per usual, but I wouldn't mind if she was a Tome unit. (Also the reason Eir as the Lead because then she hopefully gets more attention but Fjorm being the backpack could steal that attention because she is popular (see all the alts Fjorm already has))

But what about you?