Why is Batman superior (in the eyes of the average audience) to all other superheroes in the DC characters? Its because he is relatable. He is a human being who faced a tragic life-changing event and found a way to make himself better so that nobody else in his city has to go through what he did. Every person in this world has had a tragedy in their life, regardless of their socio-economic status. This is what makes Batman relatable to audiences around the world. Let's give Bruce Wayne the vacation he deserves and focus on other heroes who could follow his lead.
Wonder Woman:
1. Teach the audience about the real-life Amazon civilization:
When I travelled to Bodrum in Turkey, I took a tour of the surviving substructures and ruins of the Mausoleum of Mausolus, one of the Seven Wonders of the Ancient World. I was surprised when the tour guide showed us the statues and artifacts of the Amazon warriors. He told us the story of how the Amazons lived in Bodrum and fought against the Greek and Persian empire. The most important value of the Amazon history is that they were women who were abused by men, but found refuge in this civilization where the women (overcame politics and differences to) teach each other how to fight and prevent the oppression of men. This is something women and even men from all over the world can relate to and understand. Introducing these historical elements into the Wonder Woman origin will make the character and her race relatable and realistic.
2. Cast someone who has a mixed-ethnic look:
Wonder Woman needs to be someone who is of a mixed ethnicity, someone who any female in any part of the world can relate to, thats part of who the Amazonians represent. The Amazon, if you look up their history (in real life), was a civilization made up from women from Northern Africa, Persia, Meditaranian (Turkey, Italy) and Modern Ukraine. These warriors breaded with male warriors they captured from the greek empire and persian empires. Hence, Wonder Woman needs to look ethnic, like a mixed actress that looks like no-race in particular.
It will also add to a "global" look of the Justice League.
3. She needs to overcome a lot of barriers:
Make it hard for her to accept the real world when she comes out of Themiscyra. Make her fight for injustice and oppression, whether its against a man or a woman. Make her extremely sensitive to the war and violence in the world, and make her go through a cultural shock. She needs to resist the CIA or FBI or whoever tries to bring her in, especially if the officers or agents are men who try to "cuff" her.
4. Make the movie politically themed:
Bring an enemy who makes a threat to Washington. Set the fight scenes in washington. Give her an American appeal, but also let her save tourists from around the world visiting the capital. I personally think if there was a scene of her visiting the Lincoln Memorial and reading Lincoln's speech but asking "why aren't people following this? why is there still discrimination, racism and war?". Get an enemy from her past to attack the UN, and get her to fight inside the UN headquarters and save the world infront of the world's top leaders.
Most importantly she needs to raise the question: If the Amazons lead the world would there be no more war or oppression?
5. Remove the greek mythology connections:
We live in a world where a large portion of the audience is monotheist or atheist. Although religion really shouldn't be a factor for a superhero, for Wonder Woman it must be addressed. In the origin of Wonder Woman written by Marston, this greek mythology connection just wasn't there, and at that time Wonder Woman was very popular. Now in this world, how many people will relate to a superhero who is a demi-god? Thor was able to do it because he's of a fictional "god" mythology. But with Wonder Woman, many people would just find it unrealistic and may even be offended. So i say scrap the religious greek mythology elements and just briefly mention an ambiguous higher-power who saved the Amazons and gave them a new Paradise outside of the human world.
6. Give her pants and a jacket.
Just like Superman is a symbol of "hope", Wonder Woman should be a symbol of "justice" not "sex". Its time she gets a costume that any father be proud to have his daughter wear on Halloween without being worried about creeps. Make children of all ages and background (conservative or open-minded) be able to wear the costumer without feeling insecure about her size or shape.
Aquaman:
1. Connect the origins of Atlantis and Themiscyra:
Show that the real-world was engulfed in war during the times of the Trojan War, and it became unliveable, and thus the people of Atlantis found a way to survive outside the real-world. Show the Trojan War where the people of Atlantis and Amazons fought alongside each other against the Spartans.
2. Cast an experienced and beloved actor:
Cast someone with a strong following (whether a TV show or a strong movie career), who is in his 30's and is well-known for his acting chops, rather than his looks.
3. Make his origin different, and more relatable:
Introduce an Aquaman who lives in a metropolitan city, has an ordinary desk job, but show him getting dehydrated very easily and show him entering the swimming pool at the end of each day and then see his skin recovering. Let him see a major natural disaster (such as the BP oil-rig leakage). Make him go to the beach near the disaster and get hit by noises of the sea creatures and experience their pain. He would immediately jump into the water to save them. And this is where he would encounter other Atlantanians(? is that the word?).
4. Make him fight Lex Luthor and encounter Superman/WonderWoman:
This is very important when connecting him to a larger audience. Instead of him facing off against his own villains, somehow link Lex Luthor to the natural disaster or one of Luthor's greater plans that is polluting the oceans and affecting life in Atlantis. See him face off against Superman. Create a life-underwater vs life-on-land situation where he fights against Superman. Have Wonder Woman intervene and make Aquaman understand the positives of life-on-land, just as she had to learn.
5. Make him refuse to join the "justice league":
Aquaman needs to be the cool King of Atlantis who refuses to conform to the leadership of Superman. Let him point out that without his world underwater, life on land would suffer. Also he could say that through his "sea creatures" he knows more land-heroes exist.
6. Develop a romantic bond with Wonder Woman: