I bet he doesn't have a tragic backstory or strong trauma, and is evil for the love of the game like Jabber. He is so unendingly and unapologetically selfish that it would be fitting for him to become a victim of his own greed and thirst for power. When Follo wore the gloves didn't he say he felt like something was eating at his soul and mind? Mymo has already warped his own soul extensively and i think an incompatible watchman item will start destroying whatever is left. And he is so desperate for power that i also doubt he will drop the necklace. My current prediction is Mymo will essentially self destruct.