I would also add to the line-up:
The Outsiders.
Damian Wayne no longer feels like he fits the idea of what a Teen Titans is, instead he belongs in the shadows, a closer amalgamation of his father and is grandfather. He recruits others who fight the good fight but with slightly different tactics than his father or some of his brothers would approve of.
Damian Wayne the Grey Robin
Maya Ducard Nobody
Nika Flatline
Stitch
Goliath, Robin's faithful companion. Despite having been freed, he returns to Damian's side.
Diego Perez Chupacabra
Split, real name unknown, from the John Irons Steel series, a thrill seeking teleporter who unexpectedly get's caught in the middle of one of Robin's escapades and decides to tag along.