Yes, several TV shows and movies have portrayed characters who either explicitly or implicitly exhibit signs of Dissociative Identity Disorder (DID). Here are some examples:
Fight Club (1999) - The main character, played by Edward Norton, suffers from DID, though this fact is not revealed until later in the film. His alternate personality, Tyler Durden (played by Brad Pitt), takes on a more dominant role as the film progresses.
Black Swan (2010) - Natalie Portman's character, Nina Sayers, appears to experience dissociation and identity disturbances as she becomes more deeply entrenched in her role as the lead in "Swan Lake."
Mr. Robot (2015-2019) - The protagonist, Elliot Alderson (Rami Malek), struggles with dissociative experiences, and throughout the series, it is revealed that he has different identities, including Mr. Robot (Christian Slater), who plays a significant role in the plot.
Identity (2003) - In this psychological thriller, several characters converge at a motel, and it becomes apparent that they might be manifestations of the same person's multiple personalities.
United States of Tara (2009-2011) - This TV series revolves around a woman named Tara Gregson (Toni Collette), who has DID, and her various alter personalities, each with unique traits and challenges.
Split (2016) - As previously mentioned, this movie focuses on a man named Kevin Wendell Crumb (James McAvoy) with multiple identities, one of which is "The Beast," a dangerous and violent alter.
It's essential to note that while these characters may display dissociative tendencies, their portrayals may not always be entirely accurate or representative of real-life experiences with DID. Some of these works might take creative liberties for dramatic or storytelling purposes.
Dissociative Identity Disorder is a complex and sensitive topic, and when exploring it in fictional settings, it's essential to remember that artistic portrayals may not reflect the full range of experiences and challenges faced by individuals with this condition. As always, empathy, understanding, and seeking reputable sources for further education can help foster more accurate perceptions of mental health conditions.