Sōsuke Aizen
is the "Sexta Espada", signified by the "6" tattooed to his back. His name comes from European architect Nicholas Grimshaw and the German word for hunter. Grimmjow has a defiant, punk attitude towards authority, and can be cowed only by Sōsuke Aizen. Despite his personality, Grimmjow has a sense of honor, repays those he feels indebted to, and is unwilling to battle handicapped opponents. Motivated by his dream to become a hollow king, Grimmjow was originally a panther-like Adjuchas Hollow who led a close-knit gang of five other Adjuchas who all became his "fracciónes" after their transition into arrancars. Grimmjow dresses in a vest over bare skin and loose pants, and sports blue hair in a style popularized by Billy Idol. A still-articulated right jawbone is all that remains of Grimmjow's hollow mask, and his hollow hole is located on his abdomen.