Tier Harribel is an Arrancar who served under Sosuke Aizen, the former 5th division captain of the Gotei 13 and the main villain of the Arrancar Arc. Appearance-wise, she looks no different from a regular human, though her incredible abilities and fighting prowess make her stand out.
Tier was a member of Aizen's elite Arrancar squad called Espada. She bears the number «3» among the ten Espada. So as one of the strongest Espada, it goes without saying that she played a major role in the Arrancar Arc. That being said, the story somehow moves along without ever mentioning the fate of Tier Harribel. So what happened to her at the end of the series?
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Before talking about her current situation, it would be best to first look back at Tier's journey thus far. As mentioned earlier, Tier Harribel appeared mostly in the Arrancar Arc. That being said, her screen time was somewhat limited compared to other Arrancar, such as No. 6 «Grimmjow», No. 4 «Ulquiorra», or even the former No. 3 «Nelliel».
For the most part, she stays in the background and only has minimal dialogue here and there. The fact that she rarely talks makes it even harder to notice her existence. Then the final fights at the fake Karakura town happen, which was pretty much her biggest scene in the entire series. It's there that Tier fought the captain of the 10th Division, Toushirou Hitsugaya.
She unleashed her full power and gave Hitsugaya a very hard time. It took a captain and several Vizards in order to put enough pressure on her. Unfortunately, after the No. 1 «Coyote Starrk» and No. 2 «Barragan Louisenbairn» lost their respective battles, Aizen decided to strike Tier because she was no longer necessary to him. That was the last
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