Robert Napier

Robert Napier was the half-brother of Jack Napier/Joker and son of serial killer Arthur Napier. Largely ignored by his father, Robert spent most of his time with Jack. As a young adult, Robert became a recluse due to his mental problems and extreme heliophobia. Robert was murdered by his brother after the latter escaped from Arkham Asylum.

Early Life
Robert Napier was born on April 8, 1998 to Arthur Napier and an unknown woman. Robert's mother completely abandoned Robert after he was born, leaving Arthur to care for him. When Robert was six years old, Arthur was arrested and convicted of numerous counts of murder.