In Despicable Me 4, the wall-climbing villain who resembles a gecko is Maxime Le Mal.
Maxime Le Mal is the principal villain of Despicable Me 4. He uses technology and an insect-like transformation to gain abilities associated with a gecko, including climbing walls and moving across surfaces.
Maxime is an old rival of Gru and seeks revenge after their history at the Lycée Pas Bon villain school. His conflict with Gru becomes more personal when Gru’s family is placed in danger.
The character is distinct from earlier franchise villains such as Vector, El Macho, and Balthazar Bratt. Maxime’s surname is “Le Mal,” which translates roughly from French as “the evil” or “the bad.”