Nero

"Can we do this cleanly? No more cowboy stuff?
That "cowboy stuff" gets the job done and doesn't leave any witnesses."

- Kern and Nero discussing the latter's modus operandi.^(src)

Nero
Biographical
Died	2503
Physical
Race	Terran
Gender	Male
Political
Occupation	Reaper

Colonel Nero was an extremely violent Dominion reaper and rogue military agent. He sported a scar or tattoo over his left eye and smoked cigarettes.

Nero established a violent pattern in his operations.

Biography

Nero led his squad of four reapers – himself, Kern, Rock and Pfaff, in an illegal operation against a Dominion base. Kern asked him not to kill everyone, but Nero said they had to eliminate witnesses, and would shoot Kern if he complained about his orders again.

The plan was to steal some Mark VII hub drives and later sell them to the Kimeran Pirates. Shortly after approaching the marines and goliath defending the base, he threw explosives and opened fire. They ended up destroying the base. Kern berated him, prompting Nero to shoot him down. However, Pfaff and Rock convinced him not to kill one of their own. Nero contacted the Dominion, saying pirates had attacked, blowing up the base and injuring Kern.

Prison

In the hospital, Kern, who had lost a leg, convinced Pfaff and Rock to turn on Nero. They would lie, saying they weren't expecting that kind of operation. The Dominion arrested him, and Pfaff (at least) testified against Nero at the trial, resulting in him being sentenced to Gannemuck Prison, where he would be executed. The other three reapers left the service.

On the date of Nero's execution, he overpowered the guards and escaped. Shooting out video cameras, he used the guards' own communication system to fool them. He stole weapons and explosives, using the former to kill guards and the latter to set a remote detonator in a vital point in the prison. He stole a ship and escaped, blowing up the prison as he did so.

Revenge

Nero went on a campaign of revenge. He quickly located and killed Rock. When he found Pfaff, the latter revealed Kern's location in exchange for survival. Nero did not honor the deal, killing Pfaff.

Nero traveled to Roxara to kill his last target. Unknown to him, Kern had married and had a small daughter, Tiffy. The latter encountered a protoss dark templar, Lassatar, who was there seeking a xel'naga artifact, and offered to walk her home safely. Nero arrived and, surprised that Kern had a wife and child, threatened to kill them both in front of the legless (and nearly helpless) Kern. They were interrupted by Lassatar, who wouldn't let any harm come to Tiffy.

Nero used his jumpjets and demolition charges to great effect, but eventually was crippled by the protoss. He reviled Kern for being a weakling, taunting him for being unable to kill him when Kern said he wouldn't give him mercy. Kern cut him off by shooting him in the head with his own gun.