chad-was exposed to sperichal energy to much an gaind powers. He irst relaized it when saving ichigos sister, karin, from a hollow. Later he went to save rukia kuchki. he was easly beat by Shunsui Kyoarku. Later he's seen with zaraki and the group.
Months later he go into huecdo mundo with uryu, and ichigo. He improved his right arm. When he fought gantenbate, 105th privion espada, his right arm again. It grew 5 times in size like a shield. He then gains his left arm. It is a white arm