Grimmjow Jaegerjaquez (グリムジョー・ジャガージャック, Gurimujō Jagājakku)is an Arrancar and was the Sexta (6th) Espada in Sōsuke Aizen's affiliated army.

Grimmjow is a tall, muscular man with light blue spiky hair and light blue eyes, the latter including green lines below them, similar to the eye markings on the Panthera genus of cats.

Grimmjow's attire consists of a white hakama, a black sash and a ragged white jacket with an upturned collar. The inner lining of his jacket is black and Grimmjow wears it with the sleeves rolled up and leaving it open to expose his muscular chest. The remains of his Hollow mask consist of the right jawbone and his Hollow hole is located on his abdomen. His tattoo number (6) is located on his back, near the right side of his Hollow hole. Grimmjow also sports a large scar across his torso, gained from his first battle with Ichigo Kurosaki.

Sometime after Aizen's defeat, Grimmjow's attire now consists of a black shirt which he keeps partially unzipped, exposing the scar he received from his first encounter with Ichigo.He also wears black pants, with black boots styled differently than the boots he wore as an Espada, and two belts around his waist, with his Zanpakutō sheathed on his left side along his top belt. However, he still wears the jacket he wore as an Espada.

Before becoming an Arrancar, Grimmjow was a small panther-like Adjuchas.

While appearing to be a laid-back individual, Grimmjow possesses a brutal, impulsive, and excessively violent personality alongside a lethally short temper. However, despite his aggression and obvious blood lust in battle, Grimmjow possesses a feral cunning and has a knack for quickly exploiting any opening his opponent reveals.In addition, he is blunt, sarcastic and quite sadistic, revealing a psychotic grin or laughing maniacally whenever he becomes excited.He is also very rude and quite disrespectful. Grimmjow uses none of the honorifics in the Japanese language, except when addressing Aizen(though he is quick to discard the formality when Aizen not here