- Spent seven years in foster care, during which he lived in thirteen different homes.
- Is an amateur boxer.
- Became a father for the first time at 29 when his partner Alyson Sandro gave birth to a boy named Brando, born on August 5, 2022.
- Has appeared in three films with Colin Farrell: The Killing of a Sacred Deer (2017), The Batman (2022) and The Banshees of Inisherin (2022).
- Born and raised in Dublin, Ireland.
- He is the fifth Oscar nominated actor to play Batman's arch nemesis, the Joker.
- He is the second non-American actor to play the DC Comics super villain, the Joker, after Heath Ledger.
- Prior to playing his arch enemy the Joker, he had once expressed an interest in playing Batman's sidekick Robin alongside Ben Affleck's portrayal.
- Was supposed to play Yorick Brown, the lead role in Y: The Last Man (2021), but he left the project when it was still in pre-production.
- Resides in Los Angeles with his girlfriend Shona Guerin, [2019].
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