The film 'Doraemon: Nobita's Great Battle of the Mermaid King' does not feature any identifiable LGBTQ+ characters or themes. Its narrative centers on the main characters' adventure to help a mermaid princess, without incorporating elements related to queer identity or experiences.

This film does not feature any identifiable transsexual characters or themes. The narrative focuses on Nobita and Doraemon's adventures with mermaids and an ancient civilization, with no elements related to gender identity or transsexual experiences.

The film features female characters like Princess Sophia, but their roles do not involve direct physical combat victories against male opponents. Combat is primarily handled by Doraemon's gadgets and the male protagonists.

The film features established Doraemon characters and new characters specific to this movie. There is no evidence of any character, previously established as one gender in the Doraemon canon or source material, being portrayed as a different gender.

This animated film is part of the long-running Doraemon franchise, featuring characters consistently depicted as Japanese. There is no evidence or common knowledge that any established character's race was altered from prior canon in this installment.