Damian Jr.
From LEGO Batman Wiki
Damian Jr. is Damian Wayne and Dick Grayson's son due to the DNA of both Damian and Dick. Damian is also the Grandson of Bruce. Damian trains him as a Red Ronin instead of Robin. Soon as he was done with training he made enemies with The Joker. He soon becomes a Vilain as when he got Joker in Arkham he decided to do work as a Villain, known as The Dark Robin.