Beast Boy was an animal shapeshifter and a longtime member of the Teen Titans.
It was revealed that Beast Boy was in Metropolis when the Nuke detonated killing everyone, Beast Boy died in the blast and recovered by Superboy, who survived the blast
Beast Boy was briefly mentioned by Cyborg. Beast boy is shown in Starfire's ending as a dog she mentions that he is missing most likely dead. Meaning she is unaware he was killed when Joker bombed Metropolis.