One of the most underrated performances of the Joker that I have ever seen is Cameron Monaghan as Jerome Valeska in the FOX show, Gotham! His performance captured the unpredictability and insanity of Mr. J from the comics! Every time he was on the screen, he showed the mannerisms, body language, and personality of the Joker! Even Mark Hamill gave him praise on Twitter!
He's even got the Joker smile!

Cameron Monaghan would be a perfect fit for the Joker! If you need anymore proof, check this out! 
His performance was easily the highlight of an otherwise forgettable show! (besides Oswald Cobblepot, who also was a spectacular character)
Cameron stole the show of every episode that he was in! I feel like it's safe to say that his performance as Jerome is easily one of the best and most underrated live action Jokers out there!

I think it's about time that he makes a big screen debut!
You see, in Gotham, they didn't technically own the rights to the Joker. So they had to use some creative liberties and workarounds to make him the Joker, without him actually being the Joker!
After seeing his performance as a Joker-like character who wasn't legally allowed to be called the Joker, I think it would be appropriate that he gets to play the real deal!

The 27 year old actor has already shown that he's got talent! He's acted in several TV shows, has had a smaller roles in films, and most famously he played Cal Kestis in the Star Wars game Jedi: Fallen Order!
Most of you probably recognize him from his role in that game!

So dear Warner Brothers, and Matt Reeves, please look into getting ahold of Cameron Monaghan as our next Joker! I guarantee you, he's gonna knock the socks off the audience at the cinema!
All it's gonna take is one bad day...