While many fans have known certain comic book villains inside and out for years, for the actors playing them, they often need to get acquainted with some of these lesser-known foes in a very short time. They might only recognize the most famous of that hero’s villains so despite any forms of research and attempts at characterization, their performances can often lead back to someone else entirely.
Their work will always be based on how the character was written, but how they present themselves on-screen goes beyond that. It’s the actor’s responsibility to elevate the actions and dialogue, and bring these iconic characters to life. So if the character feels wrong, It's often because the actor’s performance didn’t feel right for that specific villain.
There are plenty of bad comic book movie villains, many of whom failed because the actor couldn’t capture the essence of that specific character. But it’s altogether another problem when the actor captures the essence of a completely different character instead, and upended their own arc and development as a result. This is a grave sin in comic book movies, and it seems to happen far too often.
These misguided performances and poorly choses parts represent the actors who most egregiously picked the wrong comic book villain from their hero’s library to base their performances on.