- Nightmare Batman is the father of Nightmare Robin.
- The Nightmare Batman statue, which is $125, was officially released in September 2013.
- Nightmare Batman's joke is a reference to vampires' reaction to sunlight in The Twilight Saga.
- Nightmare Batman was originally classified as an assassin.
- Nightmare Batman is possibly inspired by the League of Legends champion Warwick, who is similar in theme, role, passive and ultimate.
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