"Here are the infos about the arrancars that we're looking for:
Nelliel Tu Oderschvank: Nelliel Tu Oderschvank, otherwise known as Nell Tu (ネル・トゥ, Neru Tu?), is a small, good-natured, childlike arrancar. She has light green hair, a large scar coming down from her forehead to her nose, and a pink line that stretches horizontally across her face right below her eyes. The remains of her hollow mask make up a cartoony skull on the top of her head. A crack runs along the left side of the mask and three of the teeth on it are broken off. Her hollow hole is obscured by her clothing, which consists of a simple gown. Nell's gender is hard to determine from her speech and appearance, but she's clearly referred to as the "younger sister" (gyōdai) when introduced with her three companions. During her trip into Las Noches with Ichigo, Nnoitra identifies Nell as a former Espada and suggests that the damage to her mask was received during her time as one of them." hands out a pic..

"this is her,one of the nelldonpe..and the unnamed arrancar:
this unnamed, armadillo-like arrancar is created naturally after he devours an unusually powerful girl as a hollow. In addition to giving him a new form, the girl gives him the power to create copies of his hollow form to do his bidding, collecting souls remotely and transferring the power back to himself. The clones can disguise themselves as the souls they've devoured, allowing them to mask their spiritual power. The arrancar controls the copies through an ocarina-based musical tune, played by the girl when she was alive, which also has the unique ability to force pluses to walk themselves into the jaws of his clones. Finally, the arrancar himself can hide within a small pocket dimension to mask his spiritual power while maintaining the clones, making it nearly impossible to kill him.
The arrancar's zanpakutō is named Dientes (Spanish for "Teeth"), and is activated by the command "crunch". After releasing his zanpakutō, his form changes drastically; his arms and hands turn to large club-like extensions, each with several spikes. A large, snake-like entity also forms above him, which can attack remotely."