He was replaced by Johnny Depp
When it was first announced that Colin Farrell would portray the villainous wizard Grindelwald in the Fantastic Beasts series, fans were excited for the potential of this casting. However, when the sequel came out in 2018, fans noticed that he had been replaced by Johnny Depp in the role. This has left many people asking why isn't Colin Farrell Grindelwald anymore?
It seems that Farrell was only cast for the first movie and then Depp took over the role in the sequel. The official reason given is that the filmmakers wanted a change in the tone of the character, which would have been better-suited to Depp’s portrayal. This may have been due to changes in the script, or just a new creative direction for the series. Whatever the reason, it appears that Farrell wasn't available or didn't want to return to reprise the role.
He didn't fit the role
One of the main reasons why Colin Farrell wasn't cast as Grindelwald in the Fantastic Beasts and Where to Find Them movies may have been because he simply didn't fit the role. Casting directors looked for someone that would be able to bring a certain level of menace and intensity to the part, and Farrell may not have been able to capture this. Reports have suggested that Farrell didn’t have the necessary charisma and presence to be convincing as the evil wizard. Ultimately, the producers opted to go with Johnny Depp instead, who was able to provide more of what they were looking for in the character. It's a real shame that Colin Farrell was overlooked for Grindelwald, but it's understandable why isn't colin farrell grindelwald when it became clear that he wasn't the right fit for the role.
Colin wasn't available
The biggest question of all is why isn't Colin Farrell Grindelwald? The answer may never be known, but one thing that is certain is that Farrell was not available for the role. In fact, he was already committed to a movie project when the producers of Fantastic Beasts came calling. While it's unclear if Farrell was even offered the role, it seems that due to his prior commitments, he wasn't available to take on the role of the dark wizard. As a result, fans of both Colin Farrell and the Harry Potter franchise were left wondering why isn't Colin Farrell Grindelwald?
Or Colin didn't want to do it
It's not totally clear why Colin Farrell didn't take on the role of Grindelwald in Fantastic Beasts: The Crimes of Grindelwald. However, what we do know is that he wasn't interested in it. Farrell had previously expressed a lack of interest in franchise films and this might have been why he refused to take on the role. Additionally, his comments about not wanting to make a movie "that was part of some kind of franchise" could also explain why isn't Colin Farrell Grindelwald in Fantastic Beasts: The Crimes of Grindelwald.