Kaoru Mizuno
Kaoru Mizuno (水野 薫, Mizuno Kaoru?) is a Simon Guardian who sports a pompadour. He is initially shown to be a shy person interested in sports. However, upon Yamamoto's discovery of his ring wrapped in paper with the Vongola emblem crossed out, he attacked Yamamoto, resulting in Yamamoto getting hospitalized. When he later learns of Daemon Spade's manipulation of the Shimon family, he battles against him but is easily outmatched and imprisoned along with Adelheid because he no longer has any capability to fight the Vongola. After the final battle against Daemon, he, and the other Simon Guardians are freed, and he reconciled with Yamamoto. His Shimon Ring allows him to form a powerful drill around his arm.
Read more about this topic: List Of Reborn! Antagonists, Simon Family