Monster High: Welcome to Monster High does not feature any identifiable LGBTQ+ characters or themes. While the film promotes universal messages of acceptance and embracing individuality, these themes are applied broadly to monster diversity rather than specifically to queer identities.

This film does not include any identifiable transsexual characters or explore related themes. The narrative focuses on the origin story of Monster High and its diverse monster student body, without addressing gender identity in this specific context.

The movie does not contain any action or adventure elements.

The film features characters who are the children of classic monsters, often with a different gender than their famous parent. However, these characters maintain their established genders within the Monster High franchise canon, and no character's gender is changed from their prior portrayal in the series.

The animated film maintains the established visual designs and implied racial/ethnic characteristics of its core characters from the Monster High franchise's prior iterations. No established character's race was altered.