Assuming Conor Leslie is coming on board to play Wonder Girl (whether as a regular, recurring, or one-off guest star), Wonder Woman almost certainly exists in the Titans universe as well.
If rumors are true, even Jason Todd could turn up, no doubt to complicate Dick Grayson’s life.
Perhaps Batman isn’t the only big-name superhero with the potential to turn up on Titans!
If Leslie will tackle the role, she’ll join Brenton Thwaites as Dick Grayson, Anna Diop as Starfire, Teagan Croft as Raven, Lindsey Gort as Amy Rohrbach, Alan Ritchson and Minka Kelly as Hawk and Dove, April Bowlby as Elasti-Girl, Jake Michaels as Cliff Steel, Dwain Murphy as Negative Man, Ryan Potter as Beast Boy, and Bruno Bichir as Dr. Niles Caulder.