Crazy Styxx was a drummer who appeared in Hi Hi Puffy AmiYumi: Ami Goes Bad.
Kaz attended the last of Crazy Styxx' concert. Years later, Ami feels that she is too much of a girly-girl, so she purchases a pair of drumsticks that belonged to a drummer called Crazy Styxx, who passed away in a crash. As Ami gains possession of the sticks, she becomes a bad girl and she messes around. Once Ami gained Crazy Styxx's voice, Yumi and Kaz take the sticks off her and throw them in the fire. After that, Ami goes back to normal.