Assuming you're still taking openings, here's a character I thought up just for this.
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Appearance: Standing at a height of five feet and two inches tall, she is slightly shorter than most girls her age. She has a lanky appearance, with long thin legs and arms. She is fairly petite in general, though she has a fairly well-maintained layer of muscle thanks to her athletic nature. She has shaggy blonde hair that likes to curl into a mess of locks going everywhere. Her eyes are a dark blue, and she has a tan to her peach-pink skin tone thanks to spending much of her time outdoors. More often than not she wears a simple t-shirt, primarily the kind with some witty bit of humor printed on it, and shorts.
Disguise: When in disguise, she dons a fairly simple and admittedly not particularly impressive costume. Crafted herself by modifying a a sports bra, running shorts, a pair of running shoes, and a pair of gloves, as well as the addition of a hand-designed mask. The sports bra has been given sleeves, and the running shorts have been turned into tights. The shoes and gloves have been reinforced with strips of metal, both to make them more durable and to give a bit more oomph to her punches and kicks should she need them. The mask is reminiscent of the kind worn by wrestlers. It covers her head save a small opening in the back where her hair is pulled through into a ponytail, her eyes, and the lower part of her face around her mouth. The entire outfit is black, with orange vertical lines going down the sides of her arms and legs, though her mask lacks any pattern beyond being plain black.
Real Name: Abigail Zwirn
Alias: Bulwark
Gender: Female
Age: 15
Weapons: N/A
Powers/Skills: Abigail is extremely durable. What would break the bones of most people results in the barest of scratches to her. She can be, and has been, hit by a speeding truck and come out none the worse for wear. Although she can't stop it from sending her flying across the street from the impact – She weighs no more than she appears to, and has no particular ability to prevent people or objects from moving her. Her super-durability extends to some protection from things like lasers or fire, though these have a much easier time of harming her than blades or guns would if she is exposed to them for more than a brief moment. She is otherwise just as vulnerable as anyone else – Capable of suffocating, starving, bleeding to death should she be wounded badly enough, catch a particularly nasty cold, and so on.
As for skills, Abigail compliments her durability and lack of super-strength by training in grappling and basic hand-to-hand combat skills, primarily in using an opponents size and weight against them. She is more than willing to make use of strategies and techniques that would be harmful to perform if she was less durable, as well. Despite not having super-strength, she is reasonably strong for a girl her size and age thanks to how athletic she is. She is also a skilled practitioner of parkour, initially a hobby that she has since adapted to aid her in fighting crime. That said, she is far from a master grappler – or parkour practitioner – despite her talent, and has much room to improve.
Personality: Abigail is an upbeat, generally friendly person. She is confident and outgoing, to a fault. She is often careless, the result of almost never being in any real danger herself. She has learned to take great pains to not endanger others, but she often 'spaces out' when it comes to her 'own safety', much to the concern of those who are unaware of her super-durability. She dislikes those who take advantage of others, particularly those who try to use greater size or strength to get away with it. Putting those kinds of people in their place is one of her motivations for creating her alternate identity of “Bulwark”.
Biography: A resident of Jump City, Abigail has lived there her entire life. It is unknown if she always had her super-durability or not, as she was simple assumed to have been a hardy and fairly lucky child growing up. Regardless of if it came about at a certain age or was with her from birth, the tendency of people to dismiss anything odd resulted in nobody being aware of her powers. For the longest time, she herself wasn't aware of them either. She had a reputation for being a reckless child, and often questioned why people seemed overly concerned about 'dangerous' things that didn't pose any danger at all to her. It was only when she was old enough to understand the differences between herself and others, particularly when they ended up getting hurt by things she wouldn't bat an eye at, that she began to figure it out. Otherwise she was a fairly normal kid, and to everyone else still is. She was always athletic and energetic, and excelled in physical education aspects of school. She was quick to join the wrestling club, though her small size made it somewhat difficult to get people to take her seriously at first. She quickly became known as a skilled grappler, and for doing maneuvers that should have hurt her more than they hurt her opponents. Her seeming “invincibility”, of which only she was actively aware of, led to her becoming interested in parkour. The impressive, often dangerous, feats of mobility and the appeal of exploring the nooks and rooftops of the city led to her becoming just as skilled at it as she was at grappling. She has long looked up to other heroic figures, and as she discovered the extent of her powers she considered more and more becoming one herself. She finally began her heroic career as a spur of the moment event, coming across someone being assaulted during one of her parkour sessions. Since then she has taken to the identity of Bulwark, a protector of those who can't protect themselves, and has gained some small amount of local notability.
Extra Info: Unlike some, she has no personal mentor or companion who keeps her secret identity secret, and she lacks any particularly useful resources or contacts as she is an otherwise normal middle-class teenager. This may change with time, as she has just begun on the path of heroism.