Biography

Early life

Growing up in a one bedroom home with her mother, hiding behind a bed behind a curtain when her mother "entertained" men, Fish's mother was killed one night by one of Carmine Falcone's men, who didn't enjoy the service. Hiding behind the curtain two feet away from her dead mother, Mooney promised that night to never be powerless again, and more so, to never let any man be over her.

Working under Don Falcone

Years after the murder of her mother, she came to work for Don Falcone, eventually becoming one of his high-ranking members.

While investigating Thomas and Martha Wayne's murder, GCPD detectives Harvey Bullock and his new partner, James Gordon, come to her nightclub to ask if she had heard anything as the crime had happened in her area. When they arrive, Mooney is in the middle of beating a man who had been stealing from her. Upon meeting, she warmly greets Harvey, they being good friends. After initially denying any knowledge on the identity of the Waynes' murderer, she promises to help in any way she can, while showing a cold interest in Gordon due to his straightforwardness and interest in the case. Later, she calls Bullock to tell him one of her men had received a pearl necklace, whose description matched to the one Martha Wayne had stolen from her, from a career criminal named Mario Pepper. Bullock and Gordon visit Pepper at his home, who denies any involvement in the Waynes' case. After Pepper is shot to death by Bullock while saving Gordon when the former flees, the pearl necklace is indeed found in his apartment, seemingly proving Pepper's guilt.

However, Mooney is soon visited by Gordon alone, who alleges her of framing Pepper by planting a replica of Martha Wayne's necklace on him. He also questions Bullock's involvement in this frame-up with Mooney. As Gordon is about to leave after trading words, Mooney has her men attack him, and then she herself strikes the telling blow from behind, knocking him unconscious.

Mooney is then seen watching an auditioning comedian for her club, finding him very amusing for his dark humor. She receives a call from her right-hand man, Gilzean, informing her of Bullock coming to save Gordon at her isolated plant. Bullock attempts to persuade Mooney to let Gordon go, going so far as to threaten to "go after her" if she kills his partner. Seeing this as disrespect and insult to her, she orders Gilzean on phone to hang and kill Bullock along with Gordon too. But the two detectives are saved by Mooney's superior, Carmine Falcone and his men's timely intervention.

Keeping Bullock's words in mind of how "somebody talked" from her gang to the GCPD Major Crimes Unit leading to Gordon blaming her, Mooney asks her lackey, Oswald Cobblepot, to massage her foot as she voices her ambitions to take over Gotham from Falcone, whom she now considers has gotten "old and soft". After verbally comforting Cobblepot, she confidently blames him for tipping off the Major Crimes Unit, as only he had seen with the fake pearl necklace. When he protests, stating that he would "open a vein" for her as a show of loyalty, she immediately suggests he do so while handing him a knife. When Cobblepot tries to back out, she turns her back, while mockingly calling him "[my] little penguin". Despised by this name calling and seeing this as his chance, Cobblepot tries to attack Mooney with the knife, only to be brutally beaten by her with a chair, whilst breaking his leg, and giving him his distinctive limp. Later, Falcone orders Bullock to have Gordon kill Cobblepot for snitching against Mooney, but Gordon fakes his death by letting him swim away, telling Cobblepot never to return to Gotham City. 

Despite Penguin's "death", he left trouble for Mooney. The next day, Falcone visits Mooney at her nightclub for a chat, and tells her that Cobblepot had revealed to him of her plans to take him out soon. After Mooney squarely denies it, Falcone gives the impression of believing her, and starts asking about her lover. When Mooney denies having one, only a "boy [she keeps] around for exercise" named Lazlo, Falcone implicably has the latter beaten by his men as a show of Mooney's place in his mob, much to her emotional distraught. He kisses Fish's hand and thanks her being honest. She aggressively orders everyone to leave her club soon after Falcone exits. Later, Fish's head thug Butch is telling her it was too early now to make a move on Falcone. She knows and voices her desire to amass more money and men to Gilzean, so that one day, she can personally kill Falcone with her "bare hands and [her] teeth". Butch offers to hold her shoes. She also sadistically wishes for Cobblepot to still have been alive, so that she could have made him suffer more for talking to Falcone about her plans against him.

When Gordon and Bullock return to her nightclub to ask her of the disappearance of street children from around her locality, Mooney shows little interest in the case, only revealing that there's an unknown  "international buyer" who has able and healthy children kidnapped from Gotham's streets and shipped to him.

As part of her plot to dethrone Falcone, Mooney hires a woman named Liza to seduce Falcone. Liza grows to care about Falcone and asks Mooney to be released from the plan. Mooney tells Liza about how her mother was a prostitute, and was eventually murdered by one of Falcone's men. Mooney tells Liza it taught her to never be weak and Liza agrees to stay committed to the plan.

On the Run

After being kidnapped by Francis Dulmacher, Fish gets trapped on his island, sacrificing her left eye in the process. Fish makes a friendship with the other kidnapped men and make a dastardly attempt to escape in a chopper, sacrificing the strongest in the process. However, one squad manages to shoot Fish in the process, barely surviving.

Final Stand

Fish and her men somehow escape the chopper and sail back to Gotham where she attempts to outrank crime boss Salvatore Maroni and her mirror competitor Oswald Cobblepot to become the new queen of the city. Upon her return, she meets Selina Kyle and gets her and those present with her into her gang. Fish even gave Selina a new outfit and a makeover. Fish Mooney and her gang were at a warehouse that served as Carmine Falcone's safehouse at the time when James Gordon, Harvey Bullock, Carmine Falcone, Oswald Cobblepot, and Butch Gilzean arrive which led to the former four being tied up.

While awaiting for the Maroni Crime Family to show up, Mooney was seen near Butch while asking what was done to him. When the Maroni Crime Family arrives at the safehouse, Maroni calls her "babes" repeatedly which Fish then is forced shoots him in the head in rage and a riot forms directly after. Selina Kyle makes a run for it as well as Cobblepot. After a few minutes where everyone hides and are found by Selina and those on Fish Mooney's side, Cobblepot arrives with a machine gun and ruthlessly kills Fish Mooney's gang while Selina escapes.

Knowing she is outnumbered, Fish makes a run for the top of the warehouse. Cobblepot chases her and the two engage in a fight. Butch Gilzean arrives and threatens to shoot one of them. After being forced to shoot their opponent being said by both Fish and Cobblepot, Butch shoots them both. However, he regrets it and apologizes to Fish who accepts. Cobblepot then recovers and rams her off the warehouse into the water below.

Physical Appearance

Fish is a short woman, with spiky pixie cut black hair and hot pink-dyed tips at the front. She wears very high heels or boots that make her appear taller, along with dangling earrings and expensive clothing and glittery/shiny eyeshadow, usually golden in color, and has very long and thick eyelashes.