Subject Delta

History
Subject Delta (Symbol: Δ) is the protagonist of BioShock 2. Delta was the first successful Big Daddy subject bonded to a Little Sister. He has a Delta symbol on his suit. Delta is the fourth letter in the Greek alphabet, signifying that Delta was the fourth test subject taken from Persephone for Alpha Series conversion. Delta is also a symbol commonly used in mathematics to represent change or variation.

Before his arrival in Rapture, the man who would become Subject Delta was a deep sea diver who conducted an investigation of the many ship and submarine disappearances in the Atlantic Ocean southwest of Iceland. While surveying the area in an advanced diving chamber he accidentally discovered the hidden city. He was accepted into Rapture, becoming somewhat of a celebrity for his heroics and nicknamed "Johnny Topside" by articles in the Rapture Tribune.

However, Andrew Ryan did not trust his story and was convinced that he must be a government agent sent to spy on Rapture. Stanley Poole, a journalist who had written a story on "Johnny Topside" turned him in to Ryan, who immediately had him incarcerated at Persephone Penal Colony and erased all documentation of him from the city. Thus, he effectively disappeared from the public eye like all of the other citizens who had dared to speak out against Ryan.

As a prisoner in Persephone, he was contracted out by Augustus Sinclair as a test subject for Ryan Industries's production of Plasmids and Big Daddies. He was labeled "Subject Delta," (Δ) and was transferred to Fontaine Futuristics to be used in various Plasmid experiments, performing in the Plasmid Theater to amaze crowds of oblivious Rapture citizens. Eventually, he became one of the primary candidates for conversion into a Big Daddy. He endured strenuous genetic and physiological conditioning, losing much of his free will in the process, and became the first Alpha Series protector to successfully bond to a Little Sister. His bond partner was Eleanor Lamb, the daughter of Rapture's ethical psychiatrist Sofia Lamb who had been incarcerated in Persephone not long before.

At some point during New Year's Eve of 1958, Eleanor and Delta began their normal rounds of harvesting ADAM and passed through a New Year's party. Eleanor was attacked by four Splicers, and as Delta fought to protect her, one of the Splicers used the newly-developed Hypnotize on him. The Splicers were Sofia Lamb's agents, and Lamb used the Plasmid to force Delta to kill himself in front of Eleanor, via a point-blank shot to the head with a golden Luger P08 pistol.

Vs Jack Ryan (By A midget)
Subject Delta will Start with:

Drill (with drill dash), double barrel shotgun(short range), Chain-gun(mid range), speargun(long range)

he will have: Incinerate, electro bolt, recon plasmid and winter blast plasmids.

The battle starts with Jack Ryan harvesting a little sister, her cries awake Subject Delta, who sprints to the commotion and gives jack a powerful blow, sending him flying into a room. Jack gets back up, and draws out his buck shot, loading up the explosive buck. He blasts one into subject delta, who has picked up the little sister. Delta stumbles into an enclosed room, and injects himself with an incinerate plasmid. He fires it at jack, who expertly dodges, runs back and pulls out his Tommy gun, jamming a clip in and blasting away at Delta. Delta, holding on to the little sister performs a precise drill dash, successfully striking down Jack, who falls to the ground and backs away. A crazed splicer enters the room, drawn to the sound of chaos. He begins to shoot away at Delta, obviously being part of the Rapture Family. Jack takes this opportunity to go to one of the vendor things healing himself and buying some ammo. He then goes to a gatherers garden, collecting the hypnotise big daddy plasmid. He trundles bag into the battle, to see Delta helping a little sister harvest, and hearing the screams of dying splicers being caught by trap rivets in the background. Delta turns around, to see Jack Staring over him, trademark wrench in hand, cruelty lingering on his face. Delta calmly pulls out his spear gun, inserts a single rocket bolt, flips up the sights and fires off the ammo into the centre of Jacks chest. Jack is flung backwards, then even further as the rocket takes effect. Eventually taking Jack in to the high reaches of Siren Alley, the rocket explodes, causing Jack to use more medikits and ruining any chances of children he might have. Meanwhile Subject Delta has returned the little sister to her vent, and has revived her, sending her to freedom.