Nobody asked for them - but here are the receipts.
He's created Stefan, Gwen, Leo/Matthew, Evan (also a murderer), Miguel (drugger of Lucas and associate of the Noodle's)
Dr Shah, Roger (who married Susan, who kept Will as her "EJ" clone), Zoey, Vincent Belman, Ted Laurent
Haley Chen, Jake
He also took the following characters and turned them crazy: Raines (corrupt commissioner), Jordan, Claire, Eve (to name a few)
Although he didn't create them in a legal sense, he also brought the adult Allie and Sarah to town, so their personalities are his creation.
The 12 or so other actors who have joined the show in the last 3 years were returns. This does not include characters who were in fewer than 5 episodes.