Raelin Stein

"I-I-I'm sorry... I-I didn't mean to... I didn't... I didn't... I'm s-sorry. I'm sorry. I'm sorry. I'm sorry. I-I-I..." - Raelin Stein after being forced to grab someone using her Death Arm to save them from falling. Raelin is a student at U.A. High School.
She was born in Germany but moved back to Japan with her mother after her father died in the line of duty. Her father was a hero who had the quirk to destroy anything he touched, he wore a skull mask and went by [TBD]. Her mother has the quirk to heal/repair anything she touches and while she has not specifically worked as a hero, she has provided support assistance in the past. As part of Raelin's costume, she wears a vertical half skull mask reminiscent of her father's mask. Due to her mother not having the death quirk as a power source, her power would massively drain her stamina, meaning she could only use her power in quick bursts. 
Raelin's quirk «Life & Death Duality» is a combination of both of her parent's quirks. However, unlike her parents, her quirk is not solely touch-based. One side of her body constantly heals, repairs and restores anything it comes into contact with and the other side destroys, kills and breaks anything it touches, even including the air around that side of her. 
Her quirk primarily outputs from her arms and as such, she has a set of support item gloves to help in containing the quirk. However, at higher level outputs, the glove on the 'Death' hand will be destroyed and the 'Life' hand's glove may even be repaired to such an extent that it reverts to a state before it was even made, effectively destroying itself as well. (Originally it was intended for her arms to be the only output for her quirk). 
Life Arm (Left Arm): Heals, repairs and restores anything within physical contact. Can be dangerous if used for too long on an object in good condition.
Death Arm (Right Arm): Destroys, kills and breaks anything within physical contact. The Quirk will even affect the air surrounding it. Extremely dangerous. 
When both arms are held together at a significant quirk output, they will each counteract each other and cause the quirk to instead build up inside her body. If held for too long it will explode outwards destroying everything on one side and repairing the other. 
Internally, her quirk is constantly destroying and repairing her internal organs, cells etc., which has a negative effect on her health. Due to this factor, she has been out of school for some time. During this time she has still been completing classwork but is behind everyone else in the physical activities. It is possible that this aspect of her quirk has also stunted her physical growth as she is much shorter than she should be at her age.
The default exterior output of her quirk is fairly low, she would need to be in direct physical contact with something for quite a significant length of time before it would be significantly repaired or destroyed (She does need to replace her clothes frequently but her superhero costume is resistant to the effects). If she focuses the quirk, the output increases drastically and spreads out a distance from her body, no longer requiring physical contact for the effects to activate. The exact distance will depend on the output and the output will depend on her training. Once the output has been increased it takes some time for her to bring it back down to normal levels, she can't just instantly turn her quirk off. 
She is unable to increase the output of one side without also increasing the output of the other side. This factor makes it dangerous for Raelin to work with others, which usually puts most people off. It is highly likely that the energy being used to heal/repair on the life side is directly powered by the absorbing of nearby energy through the death side. Hence why both sides must be used together for the quirk to correctly operate. 
With training, it is possible that she may learn how to effectively use only one side at a time. However, if she uses one side too much, then internally, her body will be out of balance which could cause her to feel weak and she may even collapse, extended use would likely result in death. 
One possible explanation for her quirk is that the death side ages anything it comes into contact with, her body internally stores that energy, and then the energy is expelled through the life side to de-age anything that side comes into contact with. 
Fun Fact: Animals are instinctively drawn to the life arm and are repulsed by the death arm.
Fun Fact 2: Despite being right-handed, Raelin almost always uses her left hand when performing tasks such as writing etc. 
Fun Fact 3: Due to previous incidents involving her Death Side, Raelin has developed a complex surrounding the use of her right arm. She will likely need to get over this complex to become an effective hero as both sides are necessary for her quirk to work properly. 
Fun Fact 4: In class, Raelin is seated with her destruction side facing a wall. Additionally, after the legs on one side of her chair kept degrading to the point of snapping off, causing Raelin to fall over, the school installed a metal bar on the wall for her to grab when this happens. 
Category:Character
Category:My Hero Academia