I would pick qi cuz he's my favorite character and I would make him a friendship character and also I would make him so you can date him and marry him and he would give you gifts (once your married to him) and they would be mystery boxes, any valuable gems and warp/rain totems(pretty much any totem) he definitely would have new dialogues and there would be a qi world thing that would be like a amusement park and ( it would be called Qi's Mysterious World) and you could unlock it by speaking to him in the casino after getting every golden walnut.
Oh my we have extremely different tastes. MR QI is my evil archenemy in Stardew. But I respect your opinion, everyone has those they like and don’t like. Like I really like Shane once his storyline peaks at 8 hearts. But once you marry him he resorts to his old ways. I wish they’d keep him on the better path for marriage too. That’s why even though I relate to him I keep him as a friend and not. a husband, because without a mod he always relapses once you marry him. So that’s my first pick. Also I’d love for Clint to be romance-able. He is so lonely and makes it known. He’s middle aged, not teenaged or young twenties like most of them. We need more older candidates. They could really build on his character. It’s a lot like Shane really. Depressed, moody, alcoholic (maybe?), and needs love as much as the next person. There is much potential for an improved story line for him, Marnie, Sandy, and even Willy.