As a comic book fan, I love the whole concept of a shared movie universe that Marvel brought to the mainstream. I consider myself a fan of both companies, where sometimes I'm really invested DC and then other times I'm really invested into Marvel. We have seen what Marvel has done with their shared film universe so far, and DC is trying to do the same. Here are some ideas that I hope DC puts into their shared universe. As a side note, I would like to see DC TV properties be placed into cinematic universe, more on that later though.
Batman vs. Superman:
I really wanted to see the Superman/Batman storyline of "The Girl From Krypton be adapted. As there was little hints to Supergirl in "The Man of Steel" and the prequel comic starred her. I would change it around though, so Batman/Superman/Wonder Woman are all looking for Supergirl separately. Wonder Woman believes she is another Amazonian, Batman finds out about her and sees her as another threat to earth. Superman, wants to find another of his kind. Lex Luthor should be the villain, where he is also after Supergirl, to 1) use her for his bidding 2) have her attack different cities to put blame on Superman. I would also include Metallo or some other secondary villain to fight. No Darkseid like how there is "The Girl From Krypton." Lastly, I would have that all three main heroes have never meet before, so there is some distrust throughout the film. I would call the film "The Last Son of Krypton"
Now, most people and rumors have said that after "Batman vs. Superman" will be a Justice League film and could be shot back to back. I'm sorry but I don't feel this is the right way to go. As much as DC wants to be different from the Marvel formula, this is the one area they should copy. If we take Phase 1 of Marvel, there was 5 films before "The Avengers". DC should copy this idea, enough to expand their cinematic universe. I would have the following be "Phase 1" of DCCU: "Man of Steel", "Batman vs. Superman", "Fastest Man Alive(Flash film)", "Emerald Knights(Green Lantern, Green Arrow team up film), and "Justice League".
Some notes about the films above:
Both Flash and Green Arrow would be from the same continuity of the television shows on the CW, except it will be maybe 5 years down the road, enough to, if need be to recast Flash, Green Arrow with different actors. That way the television shows could keep going on with the current actors and be prequels to the movies. Flash will have probably have Captain Cold as a villain. Green Lantern will be Hal Jordan, plain and simple, he is the most famous Lantern to the general public. Deathstroke and Sinestro will be the villains of that film.
As for the Justice League film, I feel the villain should NOT be Darkseid, there is a whole universe of villains to use. I would use Brainiac and Doomsday. I would definitely have Brainiac attack Wonder Woman's homeland and dig into Wonder Woman's origins. Brainiac will be the creator of Doomsday in this film. The Justice League line-up will be Superman, Batman, Wonder Woman, Flash, Green Lantern, Green Arrow and possibly Supergirl. Now I know, where is Martian Manhunter and Aquaman? I feel DC should put them into the "Phase 2" of their films. That way "Justice League" isn't too crowd and these characters get the proper introduction they need.
Finally, I believe that "Justice League" does end with a cliffhanger in which Superman dies during the climatic battle with Doomsday(possibly combination Doomsday/Brainaic creature). Heroes do win but lose Superman in the process which leads to the first film of "Phase 2" of DCCU which I would call "Man of Tomorrow", which would be the adaption of "The Return of Superman" storyline.
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