Gabriel comes off as a cold, harsh, and very strict man. He is very protective of his son Adrien, having kept him home for most of his life, although having a possessive and distant relationship with him. He makes executive decisions about how to keep his son safe without considering how he may feel, such as when he unjustly deems Nino Lahiffe a bad influence for Adrien and forbids him from coming to his home ever again. Gabriel misses his wife greatly and sometimes has to be reminded not to forget that his son is also grieving.

As Hawk Moth, he is cold and determined. After a villain's defeat, he determinedly vows revenge and, while stopping for a while afterward, doesn't wait too long to try again with his akumas. His goal is to claim the Ladybug and Cat Miraculouses to gain their absolute power necessary to achieve his dearest secret wish, not caring if he causes people harm in the process. He is aware of the equivalent exchange drawback of making a wish with the Miraculouses, every wish having a reaction to maintain balance in the universe, but it doesn't appear to bother him.

Description provided by the Miraculous Ladybug Wiki.