DCUO's Wondergirl is Cassie Sandsmark!
Cassie first appeared in Wonder Woman (vol. 2) #105 (January 1996) and was created by John Byrne (writer & artist).
In DC Universe Online, she is voiced by Mindy Raymond.
She appears in various content, such as:
1. The leveling mission with Giganta, she is kidnapped by her. Heroes will save her and fight with her against Giganta, and Villains
will fight her after she stole Giganta's powers (And will give her her powers back by breaking the crystals).
2. She appears in Trigon's Prison alert and the players needs to aid her fight the ghosts.
3. She is a vendor in the magic wing.
4. She is a bounty in Gotham Under Siege.
5. She can be found in the oblivion bar story mission.
6. She has her own Legends PvP-PvE character.
7. She can appear randomly fighting the giant robot at Titans tower.
8. Wondergirl can be found in Gotham Wasteland, you can talk to her or get blown away(As Villain).
9. She will appear with some titans when you fight as Villain against Raven's good soul projection.
10. She may appear as possessed by Trigon in the Unholy Matrimony raid.
11. Cassie's Bracers used to drop in Beta, but never made it to live.
In - game Items inspired by Cassie:
1. Wondergirl's Belt
2. Wondergirl Banner (Titans Episode drop base item)