I think Freeze deserves a correct interpretation... or at least a realistic one. I came up with a real-world Chris Nolan version of Freeze, who would simply be named
Freeze.
Dr. Victor Schivell - (Schivell is the original name from the Adam West series when he was called "Mr. Zero", before they got cute and literally named him "Dr. Fries" like in Batman & Robin and the early comics).
Schivell is a molecular biologist specializing in Cryonics (a real thing - it's where they're keeping Ted Williams's head), who is toying with the prolonging of life through freezing. His wife Nora is his main subject: she's dying of cancer and he puts her in cryo-stasis indefinitely until other scientists find a cure. This too is not uncommon and is 100% realistic.
Schivell is running out of funding and starts getting a little dirty. He starts taking jobs with the mob and the mob uses Schivell's lab as a torture chamber for crooks who have double-crossed them. Schivell is paid to put the mob's enemies in a giant freezer (or refrigerator), where he leaves them in there for long periods of time while slowly decreasing the temperature inside until these victims reveal the information that the mob wants; for example: who they're working with, where they stashed the money they stole from the mob, etc... Think of this as a "Saw" sort of torture, but more tame. Schivell will freeze some of these people to death, based on the mob's orders.
The important thing is that Schivell never literally calls himself "Mr. Freeze", nor does he wear a weird Freeze suit. He's going to wear the opposite.
In order to work inside the lab (freezer), he wears a scientific suit that keeps him WARM while working inside an environment that is super cold. So Victor isn't dependent on cold climates or diamonds or special suits. He's just a regular human being who wears a scientific warm-suit inside his giant refrigerator. He protects himself from the cold like any normal person would.
Batman comes into the equation when the police find frozen bodies throughout the city - like dead bodies frozen in giant ice cubes - which is Schivell's disposal of the mob's victims.
And I'm thinking an even more badass subplot would be the idea of Wayne Enterprises wanting to do business with Schivell's research company (like "CryoTech")- a situation where Bruce's "Wayne Tech" division is interested in Schivell's warm-suits as a possible military concept for soldiers in cold climates. And when Bruce Wayne isn't interested in the idea, Schivell worries about his decrease in funding, and turns to the mob for help. Sort of a Riddler/Batman Forever knock-off, but not totally.
In conclusion, he's not really Mr. Freeze, he's not called Mr. Freeze, and he is a 100% normal guy who wears a suit that keeps him warm while being in his lab freezer. The mob nickname him "Freeze" as sort of an inside joke.
And to top it off, he'll have a "freeze gun": A device that sprays liquid nitrogen that isn't really a "gun", but more like a scientific super-soaker that shoots nitrogen at victims.
A traditional warm suit like this, but with white and blue (it would be his traditional lab suit - other scientists would be wearing it too):
Something like an astronaut helmet that he wears with the warm suit:
His freeze gun: Typical liquid nitrogen spray -
A lab like this:
And the police find this at the crime scenes:
it's a combination of being totally different while keeping the essence of what the character is.
t:, with someone like Aronosky at the helm.
