Who could be the main villain in a 'batman and his dad fanfic'?

Lex Luthor would be a great choice. He could be plotting against both Batman and Supergirl. He might try to use his intellect to create a weapon that can nullify Supergirl's powers and outwit Batman's strategies at the same time.

Ink could be a great main villain. He's a character from the Batman Beyond series known for his ability to manipulate ink - like substances. He could target Robin specifically, seeing him as a weak link in the Batman - Robin duo. His powers would pose a unique challenge for Robin to overcome.

Kingpin would be a very suitable main villain. He has his criminal empire in Hell's Kitchen already, and if he decides to make a move on Gotham, it would bring him into conflict with Batman. His power, wealth, and ruthlessness would make him a formidable foe for the two heroes to face together.

The Joker would be a great choice. He could use some new - fangled chemical or device to mind control Batman. Imagine the chaos he could create with a mind - controlled Dark Knight at his beck and call. He might make Batman do really out - of - character things like laughing hysterically while committing crimes.

Ra's al Ghul could be a great choice. He might see the daughter as a potential heir or a threat to his plans for Gotham. He could try to manipulate her or use her against Batman. This would force Batman to not only protect his daughter but also try to make her understand the true nature of Ra's al Ghul.

Terry McGinnis could face off against a time - traveling Ra's al Ghul. Ra's al Ghul has always been obsessed with immortality and the betterment of the world through his own extreme means. If he had the power of time travel, he could try to reshape history to his liking, which would put him directly at odds with Batman Beyond. Ra's al Ghul's long - term plans and strategic mind would make for a complex and engaging conflict.

The Joker could also be a great choice as the main villain. He's always been obsessed with Batman. Now that Batman is getting married to Wonder Woman, the Joker could feel left out or enraged. He might try to ruin their big day in his own chaotic and unpredictable way. He could also target Wonder Woman as a way to get back at Batman, creating all sorts of mayhem in the process.

Ra's al Ghul could also be a main villain. He might see the absence of Robin as a sign of weakness in Batman's legacy. He could try to take advantage of this and further his own plans for Gotham, perhaps even trying to recruit Robin for his own purposes if Robin is out on his own.

Bane could also be the main villain. He's strong enough to physically challenge Batman and has a complex backstory. He could be planning to break Batman both physically and mentally in the game story.

Obviously, All Might would be one of the main characters. He is the 'dad' figure in this fanfic. The girl could be an original character created just for the story. She could be a young girl with a unique quirk, like the ability to manipulate light, for example. Her name could be something like Lily.