Esther Rosenthal

Estelle Rosenthal (エステル＝ローゼンタール) is a magician who first appears in Toaru Kagaku no Accelerator.

Appearance
Estelle has blonde hair and green eyes. She has a mole under her left eye. She wears a black cloak over a white blouse with a red skirt under a large belt. Her forearms are covered in bandages and she wears gloves. She wears black thigh-high socks, her legs have leather straps, and her ankles are bound with metal rings.

Background
She apparently came to Academy City for the same reason as the DA regarding Last Order, but was restrained by them in one of their warehouses for reasons unknown. There she became privy of some of DA's plans, such as wanting to use Last Order to put a new layer upon the world, make a perfect body and brain, as well as the development of the Coffins. She later escapes, determined to get to Last Order. She is likely important to their plans as the organization went to the trouble of capturing her and taking her back instead of outright killing her.

Toaru Kagaku no Accelerator
Estelle first appears while being pursued by Anti-Skill. While escaping them, she enters a certain hospital and finds herself in Accelerator's room. She attempts to ask him about Last Order, however Accelerator doesn't notice her due to using his power to deflect sound away from him while reading. While she tries to get his attention, her pursuer catch up with her and manage to subdue her. She is later tied up with several belts including her mouth. Despite her bonds, she manages to get out during the scuffle between the Anti-Skill and Accelerator who has come to take her away for questioning as she carried a photo of Last Order.

She escapes her restraints during Accelerator's battle with Nishio and the prototype Coffin, and later reappears before Accelerator, in his room, inquiring about the girl on the photo, Last Order.

After a rocky start with Accelerator, she tells him of DA and their plans and later bring him to the warehouse where she was restrained. There, they discover a huge mecha, a Coffin known as the Qiong Qi, and find out that DA's plans are already in motion.

Abilities
She is armed with a dagger and is presumed to be able to handle it proficiently. She has shown to be capable of escaping being tied, though how she was able to is currently unknown.

She is referenced as a Necromancer, though her magic is yet to be shown.