Now, I know why canonically this wouldn't work. TLQ represents stagnation, and thus cannot change. (Even though he kinda can, him being a living contradiction and all) But, since "her influence" is really just OUR PERCEPTION, I think we could bypass that!

By this, I mean that OUR PERCEPTION of ourselves in any story, possibly influenced by the voices, could alter or outright completely change something about our physical appearance.

Here's how I picture it:

In Happily Ever After, our outfit or appearance would change to something a little regal. Likely via Smitten's hand. Our nails might get shorter, we get more humanesque in appearance, things like that. Think Bird-Disney-Prince.

Conversely, in a chapter like Thorn, we'd get more monsterous. Nasty. Bigger, and more crooked. That would make our willingness to change, and to mend our relationship have an additional layer of emotion! "Though I'm a terrible beast, I still only want to help/love you."

Going down this line of thought, MOC's Quiet could be bare bones. Him having tried everything, or feeling hollow. Apotheosis could look like a paladin or priest, some kind of religious figure or fighter.

I consider PatD's Quiet a potential example of this idea. Since in Spectre, right before we die, we see a peek of our face. Much smaller, and more hummingbird-like than our appearance in the following chapter itself.