Johan is Monster's main antagonist, a nihilist who wants everyone to disappear and commits the perfect suicide.
Johan will manipulate many people into committing suicide, especially the high-ranking members of the Empire.
He will also corrupt the victims of the Empire's tyranny into terrorists and serial killers who will either kill high-ranking members of the Empire or incite hate crimes against the Empire, and many more to see his perfect suicide plan and endgame. Manipulate Esdeath to indirectly promote numerous genocides for the purpose of wiping out its population.
He will also manipulate Honest into poisoning the Emperor and his wife, preparing to bring down the empire, and if Honest succeeds in corrupting the young Emperor, he will kill Honest and turn the young Emperor into the core of a Shikoutazer to begin omnicide.
I think Johan is far more dangerous person than Honest and Esdeath.
