Aquaman could be an interesting addition. Picture Mr. Freeze's freezing technology affecting the oceans. Aquaman has to come to the surface world to confront Mr. Freeze. They could have a battle where Aquaman uses his control over sea life and Mr. Freeze uses his cold - based weaponry. It would be a clash of two very different powers.
Wonder Woman would be a great character to include. In a fanfiction, Mr. Freeze could be after some ancient artifact that Wonder Woman is protecting. The contrast between her Amazonian strength and Mr. Freeze's cold powers would make for an exciting story. She could also try to understand Mr. Freeze's pain and offer him a chance at redemption.
A Mr. Freeze crossover with the Flash could be really cool. Imagine Mr. Freeze trying to slow down the Flash using his cold powers. The Flash, on the other hand, has to figure out a way to move fast enough in the extreme cold and also try to understand Mr. Freeze's motives for targeting him. Maybe Mr. Freeze sees the Flash's speed as a threat to his own plans related to cold experiments.
I'm not sure there are many common fanfictions specifically about Batman, Mr. Freeze and diarrhea. However, it could potentially be a very strange and comical take where maybe Mr. Freeze's cold powers accidentally cause some sort of gastrointestinal distress to Batman or a bystander in Gotham. But this is really a very odd and not so common concept in the Batman fanfiction world.
Red Hood is another good option. The two have a complex relationship, and a crossover could explore their past grudges and how they might overcome them to fight a common enemy. It could also show how their different approaches to justice collide and then reconcile.
He'd be colder, in terms of personality. Mr. Freeze's influence would make Harry less warm - hearted perhaps.
One of the best Mr. Freeze stories is his origin story in the comics. His love for his terminally ill wife led him to become a criminal in his quest to find a cure. He is a tragic figure, and this aspect of his story makes it very engaging.
Master Chief from 'Halo' would be an excellent choice. His superhuman abilities and combat experience would add a new dimension to the 'Call of Duty Ghosts' story. He could lead the Ghosts in a crucial battle or teach them some of his unique combat techniques.
In the 'Harry Potter raised by Mr. Freeze' fanfiction, it could be that Harry's magic would take on an icy twist. Since Mr. Freeze is all about ice and cold, he might teach Harry to incorporate that into his spells. For example, instead of a normal Patronus, Harry could have an ice - based one. Also, the relationship between Harry and the wizarding world might be strained as he has been raised by such an unconventional figure.
In a humorous take, Mr. Freeze could be trying to make Gotham a frozen wasteland but his freezing machines malfunction and instead start causing all sorts of strange effects like diarrhea in the people. Batman tries to stop him while also having to deal with the chaos and the smell all over the city. It would be a really wacky and off - the - wall story.
Well, Mr. Freeze, originally Victor Fries. He loved his wife Nora deeply. His whole deal with cryogenics started as a way to keep her alive. There was this experiment gone wrong in his lab. After that incident, he became this cold - loving, literally - character. He's now in a state where he has to be in cold all the time, wearing that cool (pun intended) suit. And his main goal remains finding a way to save Nora from her illness.
Mr. Freeze can be quite lethal. He uses his cryogenic weapons and technology to cause serious harm and even death to his enemies.