Tony

Tony is the first true villain in May's path. Tony is the brother of Toma. Tony is one of the most powerful characters in the series and taking out King JaBard and his whole empire. In the first installment Tony hadn't appeared.

But in the sequel Tony came back to stop May. Tony was determined that since May killed Toma, he could fight back. He had stopped her, and at the time, May had no problem fighting. So this made her ready to stop him.

In his last appearance, Otamatone Vs Jabber Ball 3: The Genocide, he completely changed. He wasn't just fighting for Toma, he was fighting to prove that he is the best. This wasn't just a revenge plot. It was a way to destroy May. He murdered every living creature except for May. He eventually couldn't keep fighting and he got killed by May.