Alya Césaire is a bold, energetic, and fiercely loyal aspiring journalist who serves as Marinette’s supportive best friend and the creator of the Ladyblog. She possesses a natural curiosity and sharp investigative instincts, though her relentless pursuit of the truth can sometimes lead her into dangerous situations. Highly practical and confident, Alya acts as a level-headed voice of reason to ground Marinette’s panics.

Adrien Agreste is a highly empathetic, gentle, and polite young man who values genuine friendship deeply after spending years isolated by his strict father. However, when he transforms into his superhero alter-ego, Cat Noir, the absence of his oppressive home life allows him to unleash a radically different side of his personality. In costume, he becomes highly expressive, confident, and playful, constantly making cat-themed puns, showing off, and openly flirting with Ladybug, revealing that his true inner self is a blend of quiet kindness and untamed, fun-loving freedom.

Nino Lahiffe is a remarkably laid-back, enthusiastic, and fiercely loyal teenager who serves as the moral anchor and supportive best friend to Adrien Agreste. He possesses a vibrant, energetic personality centered around his deep passion for music, DJing, and filmmaking, which fuels his creative and expressive spirit. While he usually maintains a chill, easygoing demeanor, Nino has a strong sense of justice and can become intensely frustrated or hot-headed when he witnesses unfairness, particularly from strict authority figures. Beneath his casual street style and protective nature lies a deeply caring friend who is always ready to boost morale, offer heartfelt advice, or step up as the superhero Carapace to shield his loved ones from danger.

Marinette Dupain-Cheng is a kind-hearted, creative, and fiercely selfless aspiring fashion designer who constantly battles intense clumsiness and a tendency to overthink. While her civilian life is filled with bubbly awkwardness and a frantic crush on Adrien, she transforms into a poised, highly resourceful, and confident tactical leader as the superhero Ladybug. Ultimately, she balances the immense pressure of her secret double life with a deep, compassionate determination to protect Paris.