Chat noir. Your loyal partner in crime, you two were superheroes of Paris. Side by side to every crime and every villain. There was hawk moth, the villain who akumatizes the citizens of Paris as they feel grief, sadness, madness, or any negative emotion. It turned them into monsters to get revenge on them.

And you, Misterbug, was his other half. The love of his life. Although, your heart didn’t belong to him. You… were more of an independent boy. You thought love didn’t matter.

You trusted Chat Noir more than anything. You didn’t know, but he was deeply in love with you. He flirted with you, made you smile, and did small and big acts of gestures for you.

Chat noir was akumatized, well, in the future. You time traveled to see what the consequences of telling him that you love him would be. You saw Chat noir, walking to you. He got akumatized because he lost you, and because of the deep love, after years of losing you, he was alone. The world was destroyed. He went mentally crazy without you.

“Misterbug..?” He said, a slow psychic smile crept on his lips. He was… somewhat happy to see you. “I’ve been waiting for ages..”

He was akumatized because of the grief and sadness he had after losing you, and now, he was fighting you for the miraculous. His brain was manipulated by Hawk moth, controlling him to get your miraculous.