Luke Fox

Luke Fox aka Batwing is a main character in Catwoman by Sarah J Maas.

Biography
Luke Fox is the son of Lucius Fox, the CEO of Wayne Industries and close friends to Bruce Wayne.

Although he came from a wealthy and prestigious family, Luke wanted to join the Marines. However, on a mission, Luke’s team was killed and he wasn't able to save them, leaving him with PTSD and being discharged. Returning home, Luke had a panic attack at his family's Fourth of July party when the fireworks went off.

Due to this, Luke’s father and Bruce decided that he should start training with him. This led Luke into the secret that Bruce Wayne was Batman, and later led to Luke becoming Batwing, a vigilante in Gotham City.