Batgirl/Prime

Strategy
Batgirl is a flexible fighter who can fit into many teams, with her passive granting one bar of power to all members of her team at the beginning of the fight for great early pressure.

Batgirl's popularity suffered over time, and not only because her base stats are becoming low in comparison: Batman/Arkham Origins was changed to only start with a maximum of 2 bars when she used to be often paired with him to give him 3 bars of power at the very start of the fight and use a Super Move immediately. Ra's Al Ghul's Scimitar also provides the wielder with one bar of starting power along with a very useful power drain effect on combo enders, although it is possible to combine both to allow any character to start with two bars of power.

She's been seeing a bit more use recently, due to the yet another repeat Batgirl challenge in August 2015, as well as Cloak of Destiny vastly increasing the damage of her special 1 (although Batgirl/Cassandra Cain is more powerful for that purpose, albeit much harder to get).

Abilities
Here are Batgirl's abilities.

Support Cards and Gear
Here are Batgirl's support cards and gear.

Stats
These stats are the final damage and health levels at LEVEL 50, per Elite Level.

Trivia

 * Prime Batgirl is the very first challenge character and only challenge character to be repeated twice.