Aquaman

The Atlanteans have to divide into both bipedal and fish-tailed merfolk so that both Aquaman and Lori Lemaris can exist.

The DC movieverse has had:

three single hero films
Superman
Wonder Woman
Aquaman

two team films
Suicide Squad
Justice League

one team-up film
Superman and Batman, guest starring Wonder Woman

Other heroes also cameo - in Batman-Superman and Suicide Squad?

Do I want to see Shazam?