Grimmjow Jeagerjaques is the sixth Espada, signified by the "6" tattooed to his back. Grimmjow is very disrespectful, never using honorifics and having little respect for authority figures. He is often openly insulting to such people save for Sosuke Aizen, though he returns to his usual attitude when Aizen is out of earshot. Grimmjow has an overly violent lust for battle, always seeking out the strongest opponent in a given area. He is confident in his abilities, believing himself to be stronger than the fourth Espada, Ulquiora Schiffer. Though he shows little regard for his allies or anyone who would get in his way, Grimmjow has some sense of honor; he rescues Orihime from two arrancar torturing her in return for healing his arm, and first has Ichigo's wounds healed before their final rematch.The remains of his hollow mask consist of the right jawbone, and his hollow hole is located on his abdomen.

Before becoming an arrancar, Grimmjow was a panther-like adjuchas-****menos who wandered Hueco Mundo. He eventually met and led a group of other hollows in their mutual quest for power. As time passed and Grimmjow became the only one who grew stronger, he ate the others so that their evolution would not regress and so he could become even stronger. When his zanpakuto, Pantera is released with the command "grind", he regains some of his former panther appearance. He takes on more animal-like features such as jagged teeth, clawed hands, and a tail that can be used as a powerful whip. This state augments his speed drastically and gives him animal-like agility and movements to match. His roar can create shockwaves in the air, and he can also fire a large number of "darts" from his elbows as well as create energy from his fingertips, called Desgarrón.