Mizaru was an Arachnichimp crime lord and was the main cause of the near extinction of the Arachnichimp species.
Mizaru appeared in Simian Says. After escaping a Highbreed ship, Simian made a deal with him, selling the crime lord a Xenocyte Queen, which attempted to take him over. At first, he struggled with the queen, but managed to retain his free will. From there, he started infecting all the Arachnichimps he could find, eventually taking control over almost every Arachnichimp on Aranhaschimmia. After a battle with Ultimate Spidermonkey, he is defeated and the rest of the world is rid of the Xenocytes. He swears to enact his revenge on Ben and his team. However, he was eaten by a Root Shark immediately after making his threat.
Ben 10: Ultimate Alien
- Simian Says (first appearance; death)
He is named after Mizaru, one of the Three Wise Monkeys which sees no evil. When he was affected by the Xenocyte Queen, his eyes were the main thing covered on him.
- As a large/overweight crime-boss, he bears some resemblance to Marvel's Kingpin.