Underworld Fighter/Bodyguard Danny
It had already been a few years since Danny, for his job, left Amity Park. Working as a bodyguard or fighter in a meta-arcade. His sponsor was Veronica Sinclair, also known as Roulette, as he fought in her arena against other metas or villains for money.
Since she built her new undeground arena, where metahumans can fight for money and similar things, they are forbidden to join normal competitions as it's "unfair" against normal humans.
I mean, it would be unfair to see Superman in a boxing ring against a normal human, but still.
Roulette doesn't need to capture heroes, as the meta fights out of their own free will, and she still earns a lot of money. Even a few politicians and others came to watch the fights. From CEOs, crime bosses, and even once, the Presidents of the World!
As a fighter for Roulette and her bodyguard, Danny has had around 400 fights since the very beginning of the arena and 0 losses.
His boss asked if he could work as a warden in Arkham Asylum for the Mayor of Gotham, as it had an important meeting for one month.
As being told by Veronica, Danny had no problem with it; his sister worked in Arkham, and his daughter Dani wanted to visit her. He could stay for one month, then take his vacation to visit Amity Park. And it's not the first time he worked as Bodyguard for someone else, he did work for few people like Lex Luthor or Pinguin. For Lex he got to a job as he thought against Parasite.
1 Month later
Batman wasn't sure what was happening; no villain had broken out in more than a month. And he didn't hear anything from the Joker.
He learned that because of a new Warden who already left Arkham, no one tried to escape. Someone who one-shot Solomon Grundy K.O. with a punch and put the Joker, Professor Pyg, and Victor Zsasz into a coma with a single uppercut to the stomach?
Gordon seemed to be very happy as he said that, but seem very sad that the Warden had left.
+ Danny smiled at Dani, as they were driving with Jazz to Amity Park. Still he didn't like the talk both were doing about boys. Dani is too young!
But it had been nice to meet Pinguin again, it was a long time he worked for him and Sofia Falcone too. Or Bane from the Arena, he thought he stopped being a Villains like Victor as it's paid well enough in the Arena.
Mr Freeze:" For Nora." he earns in 1 fight the same as he does as thief.
Danny is adult, around 28 years old or older.