Disclaimer: I do not own any of the canon characters in here; characters from the Batman franchise belong to DC Comics, Warner Brothers, etc.
Note: This will be an AU where a character from The Batman universe will be thrown into The New Batman Adventures universe. Also, I'm debating whether or not to have more than just the one character move from one universe to the other. Anyway, here you go, and I may or may not throw in an OC for future use.
For the sake of understanding the timeline, The Batman universe is set one year after the season finale and The New Batman Adventures is set a few years after Batman: Mystery of the Batwoman. On top of all this, I will be making quite a few pairings alongside the main pairing, which I will let you guess soon enough.
PS: Don't give me too many flames for the poor French, I'm doing the best I can to get it right, so constructive criticism would be most helpful.
PPS: For those of you that had read my other Batman Fic, unfortunately I have lost my motivation to write it anymore, and I have put it hiatus at a later time in favor of writing this fanfic.
Gotham City, 2009, 2200 hours, Joker's Warehouse
The Joker gave a wild cackle of glee as he was slammed into the wall of the warehouse, ignoring the fact that he had quite a few bruises and some bleeding from getting savagely beaten by his attacker.
"I'm giving you two choices, clown; get out of town for the rest of yer miserable life, or I'll kill you and leave ya in the harbor." His attacker growled, claws digging into his vest and shirt with ease, already tearing the fabric horrendously.
"Hahahahaha, what makes you think I'll do that, Lizard Face?" Joker said back to the scaly face, ignoring the sharp teeth in front of him as he gave another howl of laughter.
Suddenly having a moment of seriousness, he asked "And why the hell do you need me gone? Surely you haven't teamed up with the good guys to stop me, have you?"
Growling, Killer Croc raised him higher against the wall, enjoying the sounds of unforgiving metal scraping the clown's back, which was nothing compared to the pleasure he gained seeing the Clown Prince of Crime wince in pain. "Not on yer life, Joker. Though I will easily admit that I hate yer guts as much as that drugged up ape Bane and the Bat. Why? Because unlike everyone else, your not in crime for a reason. You're just in it to get some laughs and watch the city go down in your gas, out of a sick, twisted sense of humor."
Finally pivoting about he threw the Joker, sending him into a pile of crates. Slowly he walked to his fallen enemy, drawing an old .45 pistol from a beaten shoulder holster. The safety was flicked off, the sound clearly audible throughout the silence surrounding him.
The Joker slowly raised his face, only to stare at end of the barrel of that same pistol.
"Why are you doing this?" the Joker slowly said, finally feeling something he had not felt in a long time; fear.
"Because I'm tired of runnin' from everyone," Croc said quietly. "The cops, the gangs, the Bat and his lot, the whole lot of 'em. I'm cleanin' up every loose end I can find before goin' underground to spend the rest of my life in the sewers. Nobody in their right mind will accept a gator man for a job, let alone an Arkham convict like me. The best I can hope for is a life where I can be left alone and not worry about a SWAT team leading me back into the loony bin because of my record."
Leaning down to look the Joker in the eye, he added "And I've already dealt with some former bosses; two gang lords dead, Bane's in prison in South America, and the Penguin made a deal where I have exclusive access to one of his more private booths at the Iceberg Lounge, a life-time supply of free food, and the ability to keep a secret in exchange for his life, which left me with my henchmen and you."
Giving a toothy grin to him, he said "And the henchmen are not going to be talking soon when their brains are full of lead."
Getting ready to pull the trigger, the Joker said solemnly, raising his hands "Fine, I give up, you can kill me."
But before he could grant the clown's death wish, the insane criminal bounced up in front of him, saying "But first I must give you my farewell gift!"
Cocking a scaled eyebrow, Killer Croc wasn't sure if this was legitimate or whether some evil trick was about to befall him. He was fairly sure it was the latter, but alas his curiosity bit him harder than he thought.
"Show me, clown, before I blow yer brains out." The reptile man stated bluntly, prodding him in the chest with his loaded pistol.
Silently the man gave yet another of his signature grins before heading off towards the middle of the warehouse. Upon coming to a rather large crate the Joker came to a stop. Slapping the side firmly the crate fell apart, exposing an unusual machine that Croc could not make heads or tails out of.
"What in the name of God is that thing?" he questioned, already glaring at the clown for some sign of trickery.
"Why, it's a machine I stole it out from under the nose of Black Mask! Apparently it must've been pretty important to Skull Face; he tried to chase me down for months before I killed off enough of his hit-men for him to give up. Can't say I blame the bugger; if it's from LexCorp, it must be something big!"
The name jogged his memory, before saying "So what, some big machine from Supermanville is right here, what's the big deal about it?"
"Well, if it helps, I do believe it will help turn you back into a normal human being, my dear Croc."
Croc faltered, almost dropping the gun were it not the basic body instincts ingrained into him years ago kicking into gear.
"Yer bullshitting me, Joker." He sneered, raising his gun again. "This is just another one of yer tricks, and I'm not buying it fer a minute."
"But surely you would like to at least give it a spin?" Joker said with a grin, pointing into the center, which looked to be a circular middle with some sort of capsule above it. "I know if I trick you that that gun of yours can shoot me through the glass, so I'm sure that even if you die you'll take me with ya."
Grumbling, Croc weighed his chances before finally saying "Fine, but if you try and gas me I guarantee you'll be full of holes before you take a step."
It was his dream come true; a shot at a relatively normal life. To be human, oh to be human, something he thought was an impossibility ever since that experiment went wrong in the labs. He had never expected a shot at regaining his humanity for good, to not have to hide away from prying eyes. But the chance was too good to pass up, for better or for worse.
Slowly moving to the center of the machine while making sure to keep facing the Joker, he finally got to the center, while the Joker pushed a button and the capsule came down, enclosing the reptilian criminal inside.
Pressing another button, Croc suddenly felt a pulling sensation, and fired off a shot at the Joker before he fell.