Element: Gambling - Being raised in Las Vegas has schooled Lindsay about odds and probabilities, which she uses to an extensive amount with her powers. Twice per battle, she can flip a coin after an attack's damage has been rolled. If it comes up heads, the damage is doubled. If it's tails, the damage is reduced to 0.
Power: The RNG - Lindsay's magic allows her to control what should be chaos incarnate, which causes interesting mutations if her magic overflows. Whenever Lindsay must take on a permanent change, she can roll twice and ignore one of the rolls. Using this forces her to take 2 overcharge in the relevant stat.
Finisher: Jackpot! - The luck of the draw builds up Lindsay's magic, allowing her to make a giant explosion if she gets lucky. Both she and the target take turns rolling 1d6. If the target rolls a 6 first, Lindsay takes 2 points of damage from magical backlash. If she rolls a 6 first, the target takes damage equal to the sum of all the rolls made before the 6 came up.
Weapon: Bicycles - Well, kinda. More accurately, playing cards. it's not uncommon for her to go through a deck a day, since even without her magic she can practice throwing cards idly against whatever hard surface is nearby. When she adds her magical powers, her speed turns it into a machine gun, with a 52-bullet magazine.
Lindsay has green eyes and short blonde hair that she's had dyed pink since she was 14 - the idea was that it would help her stand out in the crowded city of Las Vegas. Didn't work, but she thought it was cute so she keeps doing it. Started wearing glasses when she was 17, also because they looked cute. (and she needed them, but we'll just skip that part) The glass itself is polarized to a degree that you can't see any reflection off them - a handy feature when your main source of income is high-stakes poker.
Lindsay Telenand was an average girl living in a very un-average town. This was Vegas, there's no such thing as "quiet" in this town. No matter where you went, from the airport, to the famous Strip, to even some of the shadier places further off the beaten path, no one could escape the constant symphony of the city's biggest and most-plentiful moneymaker. There was always a row of slot machines chiming, a roulette wheel spinning, dice being rolled or the practiced patter of a shuffled deck being dealt to gamblers. The only way you could come here and not hear it was if you were deaf, and even then, one's mind would still summon thoughts of the enveloping cacophany. The girl was at the center of it all for her formative years, which in turn allowed her insight into things that she didn't even know weren't commonplace. Magic, in particular was fascinating - there were plenty of showmen in this town, but there was also true magic, otherworldly powers that were leaps and bounds ahead of mere showmanship and sleight of hand. It was this power that the young girl had taken to manipulating with ease before puberty, and sperated her from the world as nromal people see it.
Not that she had any idea of this, of course. Las Vegas has a knack for making even the most supernatural events seem completely mundane. Zombie outbreak? seen it. Werewolves and Vampires clogging the streets for a battle royale? seen it. Alien invasion threatens to colonize Earth? Seen it, took pictures, found out that water was toxic to them and saved the planet with a super soaker. Just another day in this ciy of lights. Once she actually realized that what she had wasn't natural, she took her talents elsewhere - a mentoring position at Broadview PIA. The new magic-users coming in think they're all that and a bag of chips, and it's her job to set them straight.