Okay so in my au Everyone who Akumatized are traumatized from being Akumatized and have marks from it since it was used for selfish goals. Emma tried to bottle all her negative emotions, she had ptsd from her Akumatization and well after one bad day and the final being how Adrien, stressed and upset accidentally let it out how he been signing dad name on gifts not Gabriel and how he despises her for being the last thing of mom and how she always took mom time. Adrien immediately regretted it but Emma, being 6 and hurt cursed how she hated Adrien and ran to her room to cry. Since Gabriel garbage he tried to Akumatized Emma but Emma tried to fight it off. It was no used and she became screamer. She and her cat grew into a giant beast that tried to leave Paris by all Means but Hawkmoth would hurt her through her Akumatized object. She used her powers based on her emotions so they can feel her pain