Lessar

Lessar (レッサー) is a member of New Light and was introduced in Volume 17.

Appearance
Lessar is a member of New Light. She has long black hair and is able to jump exceptionally high. For this reason she sports a dragon-like tail accessory which allows her to maintain her balance when jumping because she is afraid of heights, as shown when she had no problems jumping to the top of a building but then hesitated to jump back down.

Personality
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. After knowing Touma is allied with Dawn-coloured Sunlight, she became furious to the point of thinking of whipping him.

War in Britain Arc
Lessar appears as a New Light member heading to London with the task of transporting the Curtana Original. Lessar ends up making a mistake and gets tracked down; she is spotted by Touma and Oriana while on the run. The three of them fight but she manages to get away and they continue to give chase. Once Touma and Oriana corner Lessar, she tells them that New Light is only there as a means of transportation and sends the contents of her suitcase to their client. Lessar is shot at right after this encounter in an attempt to silence her, but Touma manages to pull Lessar away in time to save her life, Touma later take Lessar to Necessarius headquarters in order for her to receive magical medical assistance before it's too late.

Fiamma of the Right and World War III Arc
Lessar accompanies Touma on his trip to Russia in order to stop Fiamma of the Right. Throughout their time together, Lessar continuously makes attempts to seduce Touma.

During volume 20, Lessar witnesses from afar the battle between the Accelerator and Kamijou Touma. Lessar thinks to herself that "those black wings" are nothing short of "an embodiment of terror", but regardless of that she thought that Touma's stepping up and suppress that power was something much, much more overwhelming.

At the end of volume 22, while Touma fights Fiamma, Lessar helps Sasha while she draws a magic array to disrupt Fiamma's control over the Star. After she completes the objective, Lessar tells Touma to get out of there as quickly as possible and escapes.

Toaru Majutsu no Index: New Testament
She returns in volume 2, shouting at Lancis after knowing Touma's survival and became furious when she found out that he is allied with Dawn-colored Sunlight.

Toaru Majutsu no Index: Railgun SS2: Shopping Mall Demonstration
Lessar meets Misaka Mikoto when Misaka went to Russia to demonstrate esper powers developed by Academy City. After warning her about the oranges, the two spend most of the volume facing off against the forces at work behind the scene, resulting in her facing off against ten magicians, a sulfur bomb, and spiritual items.

Abilities
Lessar's magical abilities all draw from the artifacts she carries around with her and are based on her native roots. Her norse magic is based off the version mixed in Christanity to use elements not present in regular Norse magic using spices.
 * Skíðblaðnir
 * Steel Glove
 * Dromi (封の足枷) : A spiritual item which looks like a wire, needs to be put around the ankles and with that it can completely restrain it's target.
 * Lessar Special Custom (レッサースペシャルカスタム) - A steel glove that had been accidentally enhanced, the unique properties of this design makes it able to grab elements at distance via a "red laser" rather than the need to be in close proximity. Though it broke from being unable to stand the friction, it was able to grab the air on a supersonic jet and nearly replicate the "Earth Blade" via air friction.
 * Dragon Tail - Her tail maintains her balance and allows her to jump 3 stories high (30 feet)
 * Explosive Wind Spell
 * Green Lightning

Design evolution
Lessar's overall design remains fairly static throughout the series. Along with all the other members of New Light, Haimura was tasked on designing them not to look like magicians, but that of lacrosse players, and used their suits as a common symbol between all four of them.

Trivia

 * Bayloupe pointed out that she was the strongest magician in New Light when it comes to battle ability
 * While Lessar hasn't properly stated her age, she pointed out that she is younger then Kamijou; since she is a middle schooler.
 * It turns out one of the reasons Lessar attempts to seduce Touma was to get him to join New Light.

Quotes

 * (To Touma in Volume 20) “Then I have some good news for you. I may have a tail coming out from my skirt, but I’m not wearing spats down below. I’m only wearing panties under there.”
 * (To Touma in Volume 20) “Circle behind me!! Flip it up!! And forget all about the girls of the past!!”
 * (To Touma in Volume 20) “Don’t worry. I take pride in my ability to fit things so large in my mouth that it surprises everyone around me. And I don’t mind if you imagine that scene in an indecent way.”
 * (To Touma in Volume 20) “Th-this is my chance!! I’ll pay for it with my body!!”