They get Vikka for OBT? Nice!
Vikka is your typical Sniper/ADC. She has the best weapon range in the game (tied with a few other Commanders). Her basic abilities include a single target nuke, an attack speed and movement speed steroid and an AoE slow. Her ultimate is a long line skillshot dealing high damage to enemies hit and disabling their abilities for an instant. Vikka is one of the easiest character to play, she's even the one you use in the Tutorial, yet she's as powerful as any other Sniper. A perfect fit for new players!
Vikka has been in the game since the begining of Alpha tests, she isn't exclusive to anyone. But you get her for free! While she isn't very expensive it does help a lot to own a Commander you can keep despite the free rotations and getting her with the promotion lets you spent the credits on Unit Techs or other Commanders.