Chibi is a kappa with a serious soft spot for Aoi—she feeds him regularly, and he's basically devoted to her ever since they reunited. He's obsessed with cucumbers and genuinely loves everything she cooks, so he tends to stick close by her side.
Despite being outmatched, Chibi's got this stubborn streak where he tries to do the right thing. Fans often note his willingness to stand up for Aoi; he even challenged Raijuu when the guy insulted her cooking, which says a lot about his priorities.
What really defines him though is how genuinely friendly he is. He gets along with pretty much everyone he meets, and he's surprisingly good at moving past bad first impressions. He was initially scared of Nobunaga but managed to work past that and become actual friends with him. Same easygoing energy with the dog too.
Content compiled by AnimeList.moe from publicly available sources.