Maybe a power - hungry business tycoon. He wants to control the city and sees Wonder Woman as an obstacle. He discovers an ancient artifact that has the power to change the size of living beings. He uses it on Wonder Woman, making her a giantess. He then spreads false rumors about her being a danger to the city. However, Wonder Woman proves him wrong by using her size to protect the city from other threats, like a group of super - powered criminals that he secretly hired to make the city look like it needs his 'protection'.
An ancient evil god could be the antagonist. This god has been awakened from a long slumber and sees Wonder Woman as a threat. He uses his dark magic to transform her into a giantess, thinking that her new form will make her an outcast among the people. He then tries to take over the world while Wonder Woman is struggling to adjust to her new size. But she overcomes the difficulties and uses her giant form to fight the god and save the world.
Perhaps it could be an ancient god who has been awakened from a long slumber and wants to take over the world. This god would have powers that rival Wonder Woman's.
In a 'Wonder Woman Giantess Story', perhaps an evil villain creates a device that backfires and instead of shrinking Wonder Woman as planned, makes her grow to giant proportions. She then has to learn to control her new body and strength. She could start by accidentally causing some chaos in the city but then quickly figures out how to use her size to her advantage. For example, she could step over buildings to reach the bad guys or use her lasso on a much larger scale to stop them.
There was a story where Wonder Woman, while on a mission in an ancient realm, accidentally triggered an ancient spell. This spell turned her into a giantess. As a giantess, she was an even more imposing figure. She could see far across the land and spot any danger approaching. When an army of villains came to invade the peaceful villages, she simply walked towards them. Her every step made the ground shake. The villains were so terrified by her giant form that some of them ran away immediately. And for those who stayed, she used her super strength and wisdom to defeat them all.
Lex Luthor could be a great main antagonist. He could be jealous of the trio's popularity and see them as a threat to his own power - hungry plans. He might create elaborate traps and use his vast resources and intellect to try and take them down, all while trying to make it look like they are the bad guys in the public eye.
The Joker could also be a main antagonist in this fanfic. He could be interested in causing chaos not only in Gotham but also in the world of Wonder Woman. His unpredictable nature and love for mayhem would make him a formidable foe for the two heroes. He might come up with a plan that plays on their differences and tries to drive a wedge between them while also causing destruction.
The main features of the Wonder Woman giantess comic could include amazing visuals of a colossal Wonder Woman, intense action sequences, and maybe some interesting storylines that play on the concept of her increased size and its implications.
One key element is the transformation. Usually, there's some sort of magic or strange occurrence that turns Wonder Woman into a giantess. Another element is how she adapts to her new size. She has to figure out how to move around without causing too much destruction. Also, her interactions with others in this new form are important. Does she use her size to intimidate villains? Or does she use it to help and protect in a more gentle way?
Ares, the God of War, could be a likely captor. He's always been an enemy of Wonder Woman and has the power to match her in some ways.
The Cheetah could also be a main antagonist. She could be working with some anti - hero or anti - superhuman group. She uses her speed and cunning to set up situations where Batman and Wonder Woman seem to be causing trouble. For example, she could steal something and make it look like they did it.
There could be an ancient evil that is awakened by the birth of their son. This entity could see the son as a threat to its plans for world domination. It might have powers that are beyond what the son initially thinks he can handle, but through his own growth and the help of his parents' friends, he is able to overcome this powerful antagonist.