Nelliel
Tu
Odelschwanck

Nelliel Tu Odelschwanck was the Tres Espada, and unlike the rest of Aizen's army she thought the whole enterprise was pointless. She refused to kill opponents she had already beaten and argued openly that fighting for its own sake was beneath an Espada, which made her an obstacle rather than an asset.

Nnoitra Gilga solved that from behind. He struck her while she was distracted, cracked her mask, and the damage reduced her to a small child with no memory of who she had been. Two of her Fracción, Pesche Guatiche and Dondochakka Birstanne, hid her in the desert and built a life around a game of tag rather than tell her what had happened.

That is who Ichigo Kurosaki meets in Hueco Mundo: a green-haired child who spits, headbutts and attaches herself to him instantly. Restored to her adult form by injury, she is faster and stronger than most of Las Noches, and her Lanzador Verde and the Cero Doble that returns an opponent's own attack amplified are enough to put Nnoitra on the back foot. The reversion is not permanent and she cannot control it, which is the cost the character carries for the rest of the series.