Mister Bug is the temporary superhero identity of Adrien Agreste.
As Mister Bug, Adrien retains most of his personality as Cat Noir like his hastiness and his confidence in his abilities. However, according to Lady Noir, he has lost some of his sense of humor, getting a taste of Ladybug's careful side and creative thinking.
- As Mister Bug, Adrien mentions in "Reflekdoll", that he always wanted to capture an akuma with Ladybug's powers.
- Mister Bug, Aspik and Snake Noir was first revealed in concept art shown at the 2018 Comic Con Experience panel on December 6, 2018.
- Adrien is the second male to wield the Ladybug Miraculous as Mister Bug succeeding Micazoyolin, contrasting to Marinette, who is the first female to wield the Cat Miraculous as Lady Noir.
- He is also the fourth known person of French origins to wield the Ladybug Miraculous temporarily succeeding Jeanne d'Arc, La Coccinelle and his partner Marinette Dupain-Cheng.