Of course, Gotham is unlikely to spoil a huge twist about the Joker — whether he is Jeremiah or not — months before any new episodes debut, so we can only speculate at this time.
What is absolutely safe to say at this point is that Jeremiah will be no less unsettling in Season 5.
Besides, the most frequent assurances over the years were that Jerome was not the Joker, and Jeremiah delivers a whole different brand of crazy.
Now, despite the fact that fans have believed that they were getting the Joker time and time again before having their theories debunked, Cameron Monaghan’s photo (as posted on Instagram) and caption of “Ha” seems positively Joker-esque.