After writing my idea for a Aquaman, I have decided to make few changes to the story, to make it better. I won't make you read the story again, so this one will have only the changes.
Here is a link to the original story:
http://www.comicbookmovie.com/fansites/mr8866/news/?a=88269
But first, some casting.
No one really knew who Henry Cavill was before Superman, so I do think the actor that would cast as Aquaman should be an unknown, someone new. I always imagined Aquaman to look like Chris Hemsworth, but since he is already Thor, so it will need to be someone else. It will be weird to have his own brother, Liam Hemsworth, to be cast, but if he will, I will be ok with that.
Another actor that comes to my head is Kellan Lutz. Yes, I know he was in Twilight, but Kellan is a big dude, and he looks like the part. And he already was Poseidon in Immortals, so I think he could do a good job.
My last pick is Charlie Hunnam. He was great in Pacific Rim, and we all love him as Jax on Sons of Anarchy. And Charlie is a big dude too, the only problem with him is his accent, because sometimes he sounds almost Russian because of the clash of the British and American accents.
I think Kellan Lutz would be the best Aquaman out of this three.
More casting:
Mera - Amber Heard or Gemma Arterton (They would need to dye their hair to red, but Scarlett Johansson did the same to be Black Widow).
Ocean Master/Orm - Luke Evans
Vulko - Sean Bean
Atlan - Nikolaj Coster-Waldau
Atlanna - Elsa Pataky
Thomas Curry - Bruce Greenwood
King Travis - James Purefoy
And now for some changes in the story.
After the two Atlanteans solders defeat Orin, they take him straight to Orm. And Orm is shocked to realize that Orin is his brother. Vulko who also understands this, believes that Orin could be the one to save the sea.
Orm offers Orin to stand with him, and wage war against humans. Orin can't stand for that, believing that war with humanity isn't the solution and will only hurt the sea more.
Orin struggles the idea that he is a son of two different worlds.
Part of him wants to punish humans for their carelessness and lack of respect for the sea, and he wants to protect the sea life. But the other part in him is the human part. He may be not a human, but he was raised as a human, and he feels obligated to the humans and the surface world.
Orin is tempted to take brother's offer, knowing very well that tougher they will be unstoppable, but in the same time feels that there is another way.
Orm orders Mera to show the underwater beauty to Orin, and while they on the tour, Orin sees that the Atlanteans are all edgy, and ready for a war. Orin also understands that Mera is also conflicted. She wants to punish the humans, but she doesn't want kill inset people.
Eventually, Orin confronts Orm, trying to make his brother see reason, but Orm decides instead to turn on his brother, saying that nothing can stand it the way of the rise of Atlantis.
Orm and Orin fight, but because Orm is a good warrior, he is able to beat his brother.
Orin is imprisoned, but then Vulko helps Orin to escape, and the takes him to a secret place where Vulko trains him.
Later on there is the Kraken fight, and from there the movie counties like I wrote it.
In the climax, Orin and Orm fight. By some point, Orm creates a whip made from water, and hits Orin in a brutal way few times, and then orm drags Orin to the bottom of the ocean, and tries to choke Orin with the water wipe. Orin controls the water to call his trident, that injures Orm,and frees Orin from the choke. Orm then creates a sword made out of water, and the two fight more, but then Orin gets the upper hand. He is about to stab Orm to death with the trident, and Orm says: "Go on, brother, kill me! take your throne with blood!"
But Orin spars Orm, and starts walking away.
Orm: "You are weak! you will never be a king! your precious humans will kill the sea, I am the true King of the Ocean!"
Orin: "stand down, Orm. Don't make me end you!"
Orm: "I AM THE KING!"
Orm creates a spear made of water, and throws it on Orin, but the spear evaporates mid air, and suddenly a big white shark shows up and takes Orm with it.
Orin: "I am sorry...brother".
After Orin kills Orm, he buries his brother. Orin asks Vulko what he will do now, how can he be the king of the Atlanteans and also protect the humans. Orin says that know that the humans know about them, it all changes. Humans will see Atlanteans as possible threats, and that there can't be peace between the two races, only a temporary truce. Vulko says that this is the burden he will have to carry. Vulko says that to be a king is not to be able to do that ever he wants, but to be able to make the hard choices. Vulko says that someday Orin will face a cross roads, and he will have to choose between the sea and the humans, and when that day will come, he hopes that Orin will be a wise enough king to make the wise choice.
Later on, Orin is in the throne room, but he doesn't sit on the throne. Mera joins him. Orin asks will she stand with him, and help him. And Mera jokes that he wouldn't be able without her. She says that Orin will be a good king, or he will have to answer to her, and then she winks to him. Orin sits on the throne, and looks around. Then the movie cuts to Orin seem really fast in the water, and the movie ends with Orin accelerating his speed, and there is a underwater sonic boom.