Loly Aivirrne (ロリ·アイヴァーン, Rori Aivān) is the 33rd Arrancar in Sōsuke Aizen's army. She, along with Menoly Mallia are aides to Aizen.
Loly is a young, teenage-looking female Arrancar. She has long, black hair with two pigtails which reach down her back, a slender build, and her visible right eye is pink. The remnants of her mask cover her left eye, which is shaped around her eye with teeth dotted along the bottom of the mask and there is an extention from her mask into her hair which gives the appearance of a hair tie. Loly's school-themed uniform somewhat fits her name, as it includes a frilled skirt with a small black bow on the front, white half-sleeves worn from the elbows down to the wrists, and what appears to be thigh-length black-colored, white-outlined boots. She wears what appears to be white bracelets on her arms, and she also wears a white-colored, black-outlined material that ties around her neck, which reveals a fair portion of her stomach as well as her chest.
She seems infatuated with Aizen, as shown by her anger at Aizen's interest in Orihime. She also seems to be very impulsive and easily-angered, seen when she almost beats Orihime to death after she asked her to leave her room (and Menoly tried to stop her from "taking it too far", but could not stop her).
In the anime, Loly's fate is still the same but given a little more detail. When Yammy hurts her, Loly accuses Orihime of enjoying her suffering, but is shocked as Orihime again heals her wounds. When Yammy attacks Orihime, she defends her, hatefully saying she owes her and the ensuing battle lasts a bit longer, but ends the same way. When she is in Yammy's grasp, Loly shouts at Orihime not to help her, again declaring her hatred towards her. But she gives Orihime a smile before she meets her fate at Yammy's hand. The smile Loly gave Orihime, as well as the act of defending her, may imply that while she still hates Orihime, she might have come to terms with her feelings, or it may simply have been a farewell and returning favor for healing her.