8. Superman/Wonder Woman
Henry Cavill is set to make a series of cameo/supporting appearances in the DCEU moving forward (assuming talks with Warner Bros. work out), so he could very easily show up in Wonder Woman 3.
In the pages of Justice League, Wonder Woman and Superman realised just how similar they are, leading to the two embarking on a relationship with each other. At the time, DC Comics teased that this would have some serious repercussions moving forward, and Batman was far from happy about the world’s two most powerful superheroes being so closely aligned.
As he recently warned them, "They’re going to be gunning for you." When Superman asks who he’s referring to, the Caped Crusader simply states: "Whoever’s afraid of what you two could do."