Minor characters in seasons 6-12 of Teen Titans.
Jor-El - The biological grandfather of Superboy through Superman. Before Krypton exploded, Jor-El helped stop Zod's attempted take over of Krypton and helped free Argos. He was also present when Zod was imprisoned in the Phantom Zone.
Snapper Car - Snapper Car reported Jax-Ur and Mala's return in Edge City.
Trigon - Raven's defeated and banished father. His effect on his daughter's life is still shown when Raven's exposed to the Daughter of Scarecrow's fear gas, and her fear illusion is Trigon tormenting her and claiming he'll rule over her for all eternity. This apparition of Trigon is destroyed once Raven realizes that she's simply in an illusion and calls out that she's not afraid of him and frees herself from it.
Dr. Light - When Dr. Light was running from the Titans, Superboy caught him, and Dr. Light taunted that if Superboy brought him in, he'd hurt his mother, and this caused him to be slammed into a wall repeatedly until he was restrained by Raven. Following that, he thanked Raven and said he was ready to go to jail now.
Teen Tyrants - Evil versions created by Kitten using the Branding Iron of Morgaine LeFey. They are forced to serve Kitten, and Kitten has them do everything she wants, including destroying a theater that was showing a movie she didn't like, robbing an ice cream truck, and breaking into a cake store. They then fought their respective counterparts in the Titans when they arrived to stop them, and they were even with their opponents. Eventually, they gave ground until only Superboy, Robin, and Raven were left, and Robin used the Branding Iron to undo the spells, and the Tyrants were destroyed.