I'm toying with a similar problem. I'm not sure yet what I'm going to do about it.

Do you have ideas for an exercise we could do? In last year's bonuses, we had the "voice introduction" for several characters. At a minimum, that allows you to decide if you like your character's voice as a narrator (and also, if your voices are distinct enough to consider multiple different first person narrators.)

That might be something to try on a character or brainstorming day this year.

Cheers,
Michelle