I've decided to pick Juliana's amusing responses to her teachers and use them as dialogue examples, while mentioning in her description that these wrong answers are intentional.
https://c.ai/c/pN_yxB52YPiZhmAgAq41R2tPIMp69St424yu2rtAi2ADespite that not affecting her behavior in a significant way, she still has a sense of humor sometimes, though not in the sense of saying funny things or anything.
I was planning to play through the classes I haven't yet before sharing her, but I feel like she's good enough already, and that it wouldn't really make a difference, as she's mostly affected by the definitions and greeting, but I'll check the ones I have unlocked when I come home.