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Grimmjow Jaegerjaquez (グリムジョー・ジャガージャック, Gurimujō Jagājakku), originally romanized as Grimmjow Jeagerjaques or Jaegerjaques, is a prominent member in the Aizen-affiliated army of Arrancar, and the sexta (6th) Espada. He is often considered to be Ichigo Kurosaki's rival in terms of personality, and is one of the series' central antagonists.

Grimmjow appears to be a laid-back and irreverent individual at first glance, but this scruffy exterior hides a brutal, impulsive, excessively-violent personality and a lethally-short temper. Grimmjow is blunt, sarcastic, and quite sadistic, revealing a psychotic grin whenever he becomes excited, much like Kenpachi Zaraki or Hollow Ichigo. He displays little respect for authority and says whatever is on his mind, regardless of whether or not it is appropriate. This attitude leads to conflicts with Kaname Tōsen, who holds Grimmjow in the same low regard as he did with Kenpachi Zaraki. He also has conflicts with Ulquiorra Cifer, the 4th Espada, usually because Ulquiorra interrupts his battles or otherwise clashes with Grimmjow's ideals, and confidently believes Ulquiorra's powers to be weaker than his, a point he is eager to prove. He develops an additional grudge against Ichigo Kurosaki for wounding him during their first and second fights, and is eager to return the favor. He intentionally kept the large scar on his chest from their first battle as a reminder of this. Grimmjow is also infuriated by Ichigo's belief that he can defeat him regardless of how badly he is injured, which Grimmjow sees as Ichigo looking down on him.

Grimmjow is a very rude and disrespectful character. He uses none of the honorifics in the Japanese language, except when addressing Aizen (though he is quick to discard the formality when Aizen is not around), and refers to Orihime as woman in conversation. However, he does have some form of a code of honor, as he is unwilling to fight an injured Ichigo, bringing Orihime to heal him beforehand so that their battle will be a fair one, though he also wants to defeat Ichigo when he is at full strength. He also saves Orihime from Loly and Menoly, who were beating her up, to repay the debt of restoring his arm, though he immediately demands another favor afterwards. Despite his aggression and obvious bloodlust in battle, he possesses a feral cunning and has a knack for quickly exploiting any opening his opponent reveals.