Harry Melling as Mad Hatter - The Batman (allies and villians who have not appeared yet) Fan Cast | myCast.io
Harry Melling
Age: 37
male
Harry Edward Melling (born March 17, 1989) is an English actor known for playing Dudley Dursley in five Harry Potter films and for his role as Harry Beltik in The Queen's Gambit. His grandfather was actor Patrick Troughton
The Batman (allies and villians who have not appeared yet)
Here are the actors I would choose to play Batman's friends or foes we haven't seen in the Matt Reeves universe in possible sequels and/or spin-offs.
I will only include characters who have not appeared yet.