Kanna appears as a stoic girl who rarely changing her facial expression or raising her voice, but she is actually very emotional. While young by dragon standards, she is more mature than her apparent age would suggest, and when angry she can be foul-mouthed and rude. Due to her young age, Kanna enjoys frequent naps and has a ravenous appetite, frequently snacking and eating any animal she can fit into her mouth, including insects, crabs, and fish.
Tohru notes that she is mischievous and enjoys playing pranks, though this was in an ultimately futile effort to obtain her parents' attention. While this tendency lessens over time, she's not above using her cuteness or faking sadness to manipulate others' emotions. Initially jealous of Kobayashi's relationship with Tohru, she has latched onto the human woman as a surrogate mother - to the point of calling herself Kanna Kobayashi - and views Tohru as an older sister. She also has romantic feelings towards Riko Saikawa, expressing a desire for a relationship similar to what Kobayashi and Tohru have.
Kanna is the second dragon in the series to join Tohru in the human world. She was exiled by her parents for excessive pranks until she learned her lesson but decided to follow Tohru to the Human world and ended up living with Kobayashi, who she considers to be her stepmother.
- Kanna is based off of the Ainu Kamuy (goddess) of thunder and lightning, Kanna Kamuy. Her cover story at school is that she comes from Ushishir, an uninhabited formerly Japanese island visited by Ainu pilgrims, is a reference to this.
- Her personality is somewhat a resemblance to Renge Miyauchi from Non Non Biyori. Both are described as very smart, their expressions almost never change, and they love to do random things.
- She "recharges" by "plugging" her tail into an electrical outlet.
- She attends Oborozuka Elementary, along with Shouta and Saikawa.