This subject has not been given a canonical in-universe name, and its title is based on educated speculation. Although a reliable source has not yet been provided, and may never be provided, the article will be named for the most likely guess until then. Thank you, Green Lantern.
Donna Troy is Wonder Woman's little sister and the hero known as Wonder Girl.
History
Some while after the formation of the Justice League of America, Donna and several more young heroes (Robin, Kid Flash, Supergirl, Speedy and Aqualad) formed the Teen Titans.
Powers and Abilities
Powers
Notes
- This version of the character is exclusive to the continuity of the comic book stories considered to be set on Earth-21. It is an adaptation of Donna Troy/Wonder Girl. The original character was created by Bob Haney and Bruno Premiani and first appeared in The Brave and the Bold #60.
Related
- 2 Appearances of Donna Troy (Earth-21)
- 1 Images featuring Donna Troy (Earth-21)
- Quotations by or about Donna Troy (Earth-21)
- Character Gallery: Donna Troy (Earth-21)
Footnotes
  This character is or was an ally of Wonder Woman. This template will categorize articles that include it into the "Wonder Woman Supporting Cast" category. |
 This character is or was primarily a member of the younger superhero team known as the Teen Titans, in any of its various incarnations. This template will categorize articles that include it into the "Teen Titans members" category. |