Tier
Harribel

Tier Harribel is the Tres Espada, and the aspect of death she represents is sacrifice. She is a Vasto Lorde, the highest class of Hollow, and she reached Aizen's army by a route none of the others took: she had already spent years in Hueco Mundo protecting a group of weaker Hollows from anything that came for them, refusing to abandon them even when it cost her.

That loyalty carries into her three Fracción, Emilou Apacci, Franceska Mila Rose and Cyan Sung-Sun, who fight each other constantly and follow her without question. Her Zanpakutō is Tiburón and she fights like the shark it is named for, analytical and patient, reading how an opponent uses their own element before turning it back on them. Her fight with Tōshirō Hitsugaya in Karakura Town is water against ice, and neither of them can finish it.

Aizen ends it instead, cutting her down from behind mid-battle and telling her she was never anything more than a tool. She survives, and after his defeat she becomes the de facto ruler of Hueco Mundo, which is the closest thing that world has ever had to a government. Yhwach takes it from her. She is defeated and hung in chains inside Silbern while the Wandenreich strips her territory, and Hueco Mundo falls with her.