Climbing
Being female, Stephanie will never have the raw power of a man in pure muscle strength, but she knows the proper techniques for climbing and isn't afraid of open heights. After all, jump lining across Gotham's tallest buildings isn't for the faint of heart.
Driving
Stephanie can drive a car but she's most comfortable on a motorcycle. She can handle them proficiently. She can curb jump and, in a pinch could land a jump over a car (given some means of going airborne first).
Gymnastics
Stephanie began gymnastics as a young girl. It has given her the ability to remain extremely flexible, to properly tumble and roll and even fall to minimize injuries and even to avoid vertigo when doing tight flips, etc.
Martial Arts
Stephanie has some training in a couple forms of martial arts, including boxing and Judo. While her skills can certainly could use improvement, she can still stand her own and beat down a dozen street thugs or four moderately skilled minions at the same time with a combination of her martial skills and her tactical experience.
Tactics
Stephanie has studied. She understands how to manipulate her surroundings, her enemies to give her an advantage. She knows where she is within Gotham City when running the rooftops, how to set up traps for, or how to head off fleeing criminals.
Computers
Stephanie will never be an elite level hacker. For one, she hasn't the drive for it. What she does have are strong power user skills most teenagers have. With a little application and willpower, she should be able to hack into most businesses or criminal's systems, provided if she really wants to or not.
Escapology
Stephanie does have knowledge in how to get out of handcuffs. She even knows how to work her way out of plastic tie wraps like the Police use, along with general knots and forms of restraint. She knows how to dislocate joints when necessary to gain extra slack. It isn't pleasant…but she at least knows how.
Investigation
Despite being a teenager, Stephanie is as skilled in leg work and looking into 'cases' as a police detective with five years experience. After all, with a criminal father, she has had lots of practice.
Stealth
As a masked vigilante, stealth is a necessary skill to learn. While Stephanie may never achieve a certain bat-themed vigilante's skill of not being seen, she can pull a fast one on the average joe, criminal or even the police when she needs to.
Throwing
Stephanie is no baseball player. She hasn't got an 85 mph fast ball but when it comes down to it, she can hurdle a projectile with pretty decent speed and accuracy.
Motorcycle
A pocket rocket. It isn't new but when you ride a Buell it doesn't have to be new to be fast and reliable.
Mom
Mom=Home. Home=A warm bed instead of being homeless. Mom loves her daughter and hates the hand of cards life has dealt her but she's doing the best she can. Cleaned up from drugs, Mrs. Brown works as a nurse. She cares about Stephanie and would absolutely refuse to let her play Vigilante. It's a good thing she doesn't know, right?
Equipment
First and foremost, Stephanie has her Spoiler costume. Created personally by her, it features an opaque mask that obscures her features, yet provides her nearly unblocked vision via the white eyepieces. The hooded cloak provides some protection in the form of obscuring her form, allowing for an easier time hiding in the shadows. The costume is otherwise skintight to allow to maximum flexibility and movement…but this flexibility comes at the cost of not being very resistant to weapons. With the costume, Stephanie wears a utility belt with pouches that could contain various items such as grappling hooks, smoke bombs, and other items….should she be able to afford them. On the side of the belt is usually a coil of grapple line attached.
Stubborness
Tell Stephanie she can't do something and she'll raise her hackles and find a way to do it. It won't likely be the best way. It won't likely be pretty. But she'll do it or fail trying. She's been told she isn't good enough to be a vigilante in Gotham (or anywhere really). Stephanie doesn't take to being told 'no' very well at all. And it usually ends up causing trouble for the doubter.
Secret Identity
Stephanie Brown is not (yet) known as being Spoiler. The risk is real to herself and to her mother. It's a dangerous thing for criminals to know who you are. This allows an extra level of security to keep Stephanie's loved ones safe from harm.
Father
Cluemaster is Spoiler's nemesis as much as Arthur Brown is his daughter's. Neither is out to get her, but the fact that her father is a criminal who is unrepentant and intent on repeating his crimes, it leaves a lot of complications for Stephanie as a teenager and for Spoiler as an aspiring Vigilante whenever he goes to commit a crime - or the risk of him deciphering her associations.
Unknown
Spoiler is a relatively unknown vigilante in Gotham. There is very little intimidation factor when facing down criminals. They tend to attack first and wonder who the person with the purple getup is later.
Unsupported
Being the new girl on the (vigilante) block, Spoiler does not have much at all in the way of support. She feels like she is on her own against the world and as a result, doesn't believe she has (m)any place(s) to turn for help. It's a very vulnerable and lonely place to be as a teenager let alone as a young vigilante.