"Birds of Prey" underperformed at the box office for several reasons. Firstly, it was released during a competitive period and faced tough competition from other films. Additionally, the marketing may have confused potential viewers about the film's tone and connection to the DC Extended Universe. The title change from "Birds of Prey (and the Fantabulous Emancipation of One Harley Quinn)" to simply "Harley Quinn: Birds of Prey" also diminished brand recognition. Mixed reviews and a niche appeal further contributed to its disappointing performance.

No, "The Suicide Squad" is not a sequel to "Birds of Prey." While both films are part of the DC Extended Universe (DCEU) and share some characters, they are standalone stories. "Birds of Prey" focuses on Harley Quinn and her adventures following her breakup with the Joker, while "The Suicide Squad," directed by James Gunn, features a different ensemble cast and storyline involving a new mission for a team of anti-heroes. The two films are connected through the broader DCEU but do not directly follow one another.

Yes, "Birds of Prey" features LGBTQ representation, particularly through the character of Harley Quinn, played by Margot Robbie. The film explores her bisexuality, highlighting her past relationship with the Joker and her connections with other female characters. Additionally, the character of Cassandra Cain, though primarily depicted as a young girl, also contributes to the film's diverse representation. Overall, "Birds of Prey" is celebrated for its strong, complex female characters and inclusive themes.

The Joker does not appear in "Birds of Prey" as a character. While his presence is felt, particularly through his past relationship with Harley Quinn, he is not part of the story. The film focuses on Harley and her adventures after breaking up with the Joker, showcasing her independence and the new alliances she forms with other characters. The Joker is portrayed by Jared Leto in the DC Extended Universe but is not directly featured in this film.