Adrien is a dreamer and charismatic, but is also often shy, a bit reserved, and considerably innocent — particularly due to his unfamiliarity to much of the world beyond his father's reach. Even though he is not very openly emotional to most people, he is friendly, empathetic, understanding, and encouraging to others in hard times. His will for exposure, change, and making friends definitely complements his personality, although it is a bit of a struggle for Adrien due to his busy schedule.  As Cat Noir, Adrien has the freedom to act however he desires outside of his normal life, letting his wilder side come out. More optimistic and open, he says whatever comes to his mind and has a habit of cracking cat-related jokes and puns. As he said in "Plagg", being Cat Noir is the only time Adrien can be himself. Much of his exaggerated personality, especially his flirtatious behaviour with Ladybug, stems from entertainment such as anime, television, and movies due to his lack of experience with people his age beyond Chloé.

Description provided by the Miraculous Ladybug Wiki.