8) Steve Trevor
Chris Pine has been cast as Steve Trevor in the Wonder Woman movie, but with conflicting reports about the time period in which that’s going to take place, it’s hard to say if the character stands a chance of showing up in Justice League.
Hopefully Snyder chooses to include him, as it would be a missed opportunity to not have Trevor factor into the present day DC Extended Universe, especially as his role as the team’s liaison to the government added an interesting wrinkle to their dynamic.
Trevor was forced to balance helping the Justice League and spying on them, and his failed relationship with Wonder Woman from a few years before obviously complicated things somewhat (especially when she embarked on a relationship with Superman).
The character showing up in the film would also give the audience a regular person to view this God-like team of heroes through, which could be important.