Holly Robison (Batman Arkham City)

First Appearance: ?
First Refrenced: Batman Arkham City

During a patient interview with Catwoman, Hugo Strange claims that he has Tyger operatives training weapons on her and that she is their prisoner, threatening to kill her if Catwoman did not answer his questions.

This causes Selina great rage at Strange, calling him a "bastard." 

After Catwoman denies loving Batman, Strange tells her that Holly is safe in Gotham as he has better things to do than worry about "teenage deliquents"

Mad Hatter (Batman Arkham City)

First Appearance: Batman Arkham City

The Mad Hatter witnesses Batman saving Vicki Vale from the Joker's sniper riffles after her helicopter was shot down by Joker. He takes the opportunity to plant a remote hypnotic suggestion into his head, where he was ordered to come to his hideout.

After Batman regains consciousness after injecting himself with the "cure", which is really a knockout sedative and hypnotic chemical that made him more susceptible to suggestion, he sees Mad Hatter in his lair in a Park Row apartment under a strip club. He asks Batman if he wants more tea, laughing at Batman when he asks where he is is. Hatter tells him that he made him want to see what he wanted most and inquires if he was going to drink the tea, calling it his "my special tea... my speciality" and comparing her to "Alice" , who never did anything he wanted without a large amount of psychoactive control. He walks across the table, telling Batman that he has developed a special hat just for him, placing a specialised black rabbit mask over his head. He claims Batman is his new soldier until Batman fights the control, defeating him and smashing his hat under his foot and leaving him knocked out.

The Hatter had put rabbit masks on Arkham inmates to make them his loyal henchmen using 
built in hypnotic  controls.

Stephanie Williams (Batman Arkham City)

First Mentioned: Batman Arkham City

Stephanie Williams was a young woman, who Jervis Tetch saw to be Alice in the earlier days of his criminal activities. He lured her back to his lab, where he drugs her with tea and dresses her up, before learning that she is not Alice and kills her.

Before the Arkham Asylum riots, Strange showed her photo during one of the Mad Hatter's patient interview tapes, where he is horrified by the picture with her hair filled with blood. He doesn't recognise her at first, until Strange tells him to look closer and bursts into tears.

She is the first girl that Jervis Tetch kills and it wouldn't be the last.

Calendar Man (Batman Arkham Origins)

First Appearance: Batman Arkham City

Julian Gregory Day was declared by Commissioner Gillian Loeb to be one of the most deadly criminals and after he is apprehended (by Batman- with G.C.P.D taking credit) he was imprisoned in Blackgate, where it was declared that he would face the death penalty for his crimes (despite the possibility he was legally insane.)

He was a patient of Harleen Quinzel, who originally deemed him insane, before being forced to change it so he would die. 

His execution date was set for Christmas Eve and was actually locked inside the execution chamber, bound to an electric chair, when Black Mask (Joker) and his goons invade the facility and free him, (although considering executing him) and says that he owes him and that would be important. He later gets away, where it is quite possible he kills Judge Harkness in revenge, killing a street Santa Claus and visiting his party, strangling him with Christmas tree lights, hanging him from his own Christmas light display.

A week later Calendar Man was still free and attacked a New Year's Eve party, where after getting a restraining order from a girl, he decided to use a flamethrower to burn all the guests.

Alberto Falcone (Batman Arkham Origins)

Quinton Flynn

First Appearance: Batman Arkham Origins

Alberto Falcone is the son of Carmine Falcone, the famous Gotham mob boss leader. 

At some point he was diagnosed with having a split personality tendancies and to stop it from manifesting he has multiple sessions with Dr. Hugo Strange. However he eventually decideds himself that he is okay, skipping two appointments and stating that he would no longer be a test subject for Strange.

He is called by Harleen Quinzel, who was Strange's intern at the time, where she gives the subtle threat that they would tell Carmine about a possible untreated medical condition and asking if they will see him at his usual time.

Alberto goes to the restraunt, Cucinotta, where he is overheard by Black Mask speaking with a tone that almost sounded like he was making decisions for the family. Sionis calls him later and tells him that if he wanted to continue talking about his future, he should do it more privatley and stating that he had the place to do it.

Eventually his psyche breaks and the persona of the Holiday emerges, making a threatening call to Sionis.

On Christmas Eve, Alberto Falcone was abducted by the Penguin, a new mob boss rivalling Falcone and taken to the Final Offer as a way to try and remove Carmine from weapons deals. He is torutured, where he continuously refuses (getting cigar smoke blown into his face) and calls Penguin a "Psychotic little bastard," and is hit in the stomach with the handle of his umbrella. Penguin starts with a cattle prod, until Alberto says he will make his father stand down from the business. However Penguin says that he doesn't hear the sound he wants to hear, poking him continuesly with the prod, until Batman arrives and begins to interrogate Penguin.

During the confusion with Deathstroke, it is most likely that Falcone escaped and fled from the ship.

Holiday (Batman Arkham Origins)

Quinton Flynn

First Appearance: ?
First Reference: Batman Arkham Origins

Holiday is the split persona of Alberto Falcone, the son of Carmine and the Black-sheep of the Falcone Crime Family.

Alberto went to sessions with Dr. Hugo Strange to try and help him, but eventually decided he was okay and skipped two appointments.

However the Holiday persona manifested itself and prior to the Christmas Eve incident and he made a threatening call to Roman Sioins late at night, telling him that he needed to get his affairs in order and that things are changing in Gotham as the "wolves descend." Sionis begins to make a threat but Holiday declares himself to answer to and be a much more powerful person than Black Mask, hanging up when Black Mask makes another threat.

Wyatt (Batman Arkham City)

First Appearance: ?
First Appearance: Batman Arkham City

Wyatt was an inmate in Arkham City, who went missing after he went investiagting in the sewers, which led to everyone believing him to have been eaten by Killer Croc, who had made his home there after being transfered to the prison.