She is a member of New Light and was introduced in Volume 17. Lessar is a member of New Light with black hair and a dragon-like tail accessory which allows her to keep her balance when jumping because she can jump very high, but is also afraid of heights, as shown when she had no problems jumping to the top of a building but then hesitated to jump back down. She is the kind of girl who doesn't know how to keep a low profile. Lessar has so far made the most aggressive attempts at seducing Touma out of all the girls interested in him, and doesn't try to hide it. She once made a move on Touma while in a enclosed space in Russia but it is not shown what happened. After her clothes got wet from the snow and her bra could be seen through her top, instead of being embarrassed, Lessar is more annoyed that her secret weapon to seduce Touma has been wasted after all of her preparation. 

Set in a city of not only scientifically advanced superhuman students, but in a world where magic is also real. Kamijyo Touma's right hand, the Imagine Breaker, will negate all magic, psychic, or divine powers, as well as his own luck. One day he finds a young girl hanging on his balcony railing. She turns out to be a nun from the Church of England, and her mind has been implanted with the Index Librorum Prohibitorum&mdash;all the magical texts the Church has removed from circulation. 
(Source: Wikipedia) 
Note: Includes 16 prologues, 18 epilogues, and 6 extras.

World War III is over. Touma disappears. Accelerator spends his days with Last Order and Misaka Worst. Shiage uses the secrets he gained in Russia as a bargaining chip.
 
But this peace doesn't last long as the Freshmen arrive...
 
(Source: Yen Press)
 
Note: Includes 21 prologues, 22 epilogues, and 2 extras.

Side-story novel to the Index/Railgun. 
Misaka Mikoto is invited to Russia to demonstrate the abilities of Level Five in a shopping mall. There she meets a girl named Lessar.

Science, magic, and a nun on the run! Kamijo and Index return just in time to celebrate A Certain Magical Index’s 10th anniversary with a brand-new season. After their deadly struggle against the Catholic Church and the pending war between magic and science, Kamijo must work harder to protect Index. But with tensions high all around, what new adventures await them in this next chapter?
 
(Source: Funimation)

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**Non-anime roles:**
• Arianrhod - Memento Mori (VG)
• Tingyun - Honkai: Star Rail (VG)

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She's married to [Matt Shipman](https://anilist.co/staff/129217).

Science and magic exist side by side in this world. 
This is the peak of the science side with a curriculum for espers, Academy City. In this city where 80% of the population are students, the season has finally come when all residents are excited and fidgety! 
It's Christmas Eve. 
Amidst the city showing a cheerful hustle and bustle, ordinary boy who can’t keep up with school, Kamijou Touma, also doesn’t intend to miss this event! He was hard at work in his supplementary lessons... 
A backward glance from the default misfortune-prone bastard, the silver-haired sister freeloading in his dormitory, Index, in the heart pounding scene different from the usual, activates a new gluton skill!? While Kamijou tries to desperately stop that, Misaka Mikoto taken in by the Christmas Eve atmosphere appears before him.

The story is set in a world where supernatural powers exist through science, and magic exists through religion. 
In the story, Touma Kamijou is an ordinary high school boy with terrible academic scores and a power called Imagine Breaker. Imagine Breaker can defeat any other power, but it also undermines Kamijou's own good luck. His Imagine Breaker's immense strength is literally immeasurable, so hapless Kamijou is listed at the supernatural level of 0. He happens to meet a girl in white hanging off his window balcony. The girl says she is being chased by sorcerers, and Kamijou learns that the girl is a Church of England nun whose memories have been forcibly replaced by Index-Librorum-Prohibitorum &mdash; the 103,000 forbidden texts of the Church.