Another motive could be related to his pride. If his son has done something that he sees as a disgrace to the family name, in his over - the - top way of thinking, he might resort to hurting him as a form of punishment. This shows how his ego and his ideas of family honor can lead him to such dark actions.
He could be in shock at first. The son might not be able to believe that his father, who is supposed to protect him, is the one causing him harm. So he just stands there, frozen, trying to process what's happening.
In some fanfictions, it could be a strategic move. Gabriel might think that by getting closer to Aziraphale in such an intimate way, he can manipulate him into following a certain plan or decision that aligns with Heaven's interests. Or perhaps he's trying to assert his dominance over Aziraphale in the complex hierarchy of angels. Another reason could be that he's under some sort of spell or influence that makes him act out of character.
The fanfiction should also fit well within the world of Miraculous Ladybug. It should respect the existing lore and character relationships. If it can add new elements to the story while still feeling like it belongs in the same universe, that's a great sign of a good Gabriel Agreste fanfiction.
Well, perhaps Gabriel discovers that Adrien has been secretly helping Ladybug and Chat Noir. This betrayal, in his eyes, could lead to his akumatization. As an akumatized villain, he might have the ability to create dark illusions of everyone's worst fears. He uses these illusions to try and break the will of the superheroes and force them to reveal their identities. He could also use his power to turn the citizens of Paris against Ladybug and Chat Noir, making it even more difficult for them to operate.
One great fanfiction is 'The Secrets of Gabriel Agreste'. It delves deep into his motives and the backstory that we don't often see in the show. It gives a more complex view of his character.
It could be Lila Rossi. Since she's a master manipulator, she could find out about Gabriel's identity as Hawkmoth. Maybe she tries to blackmail him into doing something for her, but Gabriel refuses. In retaliation, she somehow manages to get an akuma and send it to Gabriel, causing his akumatization. Lila might think that by akumatizing Gabriel, she can gain more power and control in Paris.
I'm not sure. Maybe some die-hard fans of the show or those who are really into creating fanfiction.
One possible plot could be that Gabriel Agreste, in his search for a way to achieve his goals (maybe related to his fashion empire or his secret identity as Hawk Moth), gets help from an unexpected guide. This guide might be a character who has unique knowledge of the Miraculous or the hidden aspects of Paris. For example, the guide could be an old acquaintance who has connections to the magic that surrounds the Miraculous. They might lead Gabriel to discover new powers or secrets that could change his approach to his plans.
Maybe in a dark turn of events, Draco is under the influence of some dark magic or a curse that makes him act out against Ginny. She becomes a target because she is associated with Harry and the resistance against the Dark Arts. In this plot, Draco would struggle to break free from the control and Ginny would have to be the bigger person in the end.
Perhaps there's a mission where Kakashi and Sasuke are on opposite sides. Kakashi is following the orders of the village, and Sasuke is following his own path for revenge. In a confrontation, Kakashi uses his Sharingan - based techniques against Sasuke. Sasuke, not fully prepared to face Kakashi at that level, gets hurt. This would add more complexity to their relationship as teacher and student.