Jean is dignified, helpful, and quite polite. In "Mr. Pigeon", when Cat Noir needs a bathroom and Camembert, he assists him. At their request, he also tells Ladybug and Cat Noir about the events with Chloé Bourgeois the previous day in "Antibug". He is willing to pretend to be a supervillain to please Chloé and Sabrina Raincomprix, and he is concerned for Sabrina after Chloé gets upset at her and ignores her. As seen in "Despair Bear", he likes to encourage people's best traits.
- Jean's hair color and dress coat randomly change within "Mr. Pigeon"; he has his regular colors in the first shot featuring him in the elevator, but in the next shot, his hair is black, and when he lets Cat Noir into a room, his hair and coat are both black.
- In "Antibug", Jean reveals that as part of one of Chloé's games with Sabrina, he was made to act out the part of the fictitious villain "Big Mustachio." His outfit is the same while he's acting as Big Mustachio, but he additionally wears Groucho glasses.
- In the French dub, his fictitious villain name is "Super Mustache."
- In "Despair Bear", it is revealed that part of his first name is Jean and that Chloé Bourgeois can't remember the second half.
- Despair Bear is the only akumatized villain to become smaller when transformed and have a tiny size by default. Both Horrificator and Animan can become smaller, although smaller sizes are not their default forms.
- Despair Bear reappears in the two-part special event Heroes' Day.
- Despair Bear appears another time in "Gamer 2.0" for Gamer's powers.