Books about being a good person and accepting oneself despite one’s inner dark nature

Hi all! I'm looking for books where the protagonist/characters maintain being a good person despite their inner dark nature or tendencies. Something like House in the Cerulean Sea where we're shown that the children are not destined to become monsters despite their nature and what society thinks of them. I'd appreciate some lighthearted and uplifting books; nothing dark or gory please.

Thanks so much!