I Became The Novel's Biggest Antagonist

As if becoming the [Final Antagonist] of a novel wasn't enough, Ivan had unfortunately or not also the memories of 6 other Antagonists of the six other Novels he had read. What happens when the mind, strength, goals, and pride of 7 Antagonists merge? It didn't matter to Ivan. All he wants now was to protect his Faith and for that he'd continue in then same path as he took in the novel with the difference than he wouldn't let the Protagonists kill him. For that first he must join the Exorcist Academy! The problem? He was possessed!