Daryan/Machi - I would love to see something pre-canon between these two, like them plotting out their scheme together. Any way you want to write their relationship is fine with me - Daryan being manipulative and predatory, Machi being the secret mastermind, both of them genuinely emotionally attached to each other, or one-way infatuation on either of their parts, any of these are scenarios I would find interesting. If you'd rather veer wildly outside of canon, I'd love to see Daryan actually give him that house made of pianos. And if you'd prefer to do art, them posing as a team in any kind of outfits you want (I'm sort of partial to the idea of them in an AU setting as some sort of criminal mastermind team) would be amazing.