<Snipped quote by The Savant>
Hmmm, fair points! I admit that I may have read his character wrong. I'm scrapping the idea.
Also, you brought up good points about his personality and motivations, which points us to what we want to experience as their writer. I'm just saying that if you think that there's little potential to explore from pairing them, we may as well nip it in the bud and cancel the (OOC) arrangement. For example: if they work better as foes, then it's better to not pair them.
Related, if it helps to know, I already have a contingency plan if somehow, there's no other PC that can foster interesting plots with mine, that is, I'll just pair up Millie with Max, "Fine, I'll do it myself" Thanos style. 😎
All of the above here, states that if Illa and Millie cannot be paired in a romantic way that you're uninterested. I don't believe I'm misunderstanding.
You have pointed out that if there is no romantic interest that we need to cancel our prior arrangement. Our only arrangement was him being her knight, in my mind that was our only standing arrangement.
You state that if there is the possibility of them being foes, you have no interest in pairing them. Which they honestly could be foes. I've never written Illa and have no idea how he will work with Millie.
And then you confirm that you rather pair with yourself in that case to make a "you'll do it yourself" plot which cancels any potential growth for these two characters before anything has happened between them at all.
I'm going to say this, Illa can work with social plots without an issue though those plots can have consequences. Trying to make a romantic social plot with a character who is uninterested in romantic ships along with naturally being distant and self isolating and hoping he magically blossoms into a romantic man under the toxicity of rumors and high school life is similar to asking Alpheus not to participate in rumors, not go to any social events, and not having friends so he is isolated and assuming that he wouldn't get depressed.