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Serin Osman

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Serin Osman
Biographical information





Birth date

c. 2511

Physical information




190.8 centimetres (6 ft 3.1 in)[2]

Hair color


Eye color


Affiliation and military information




Service number



Team leader



Class-I: 2525

Today I will follow my predecessor's advice… You are hereby ordered to eliminate Dr Catherine Elizabeth Halsey
—Admiral Serin Osman to Captain Thomas Lasky

Admiral Serin Osman (SN: 39489-72738-SO[2]), born Serin Çelik,[1] formerly SPARTAN-019, is a Human senior officer of the UNSC Navy and current Commander in Chief of the Office of Naval Intelligence (CINCONI). Her mother was Pinar Celik and an unknown father. Her mother was a drug addict and prostitute who left Serin homeless and to pick food from the garbage. The only person who cared for her was her teacher, Alkmini Leandro, who called the police after her disappearance. She was abducted by a ONI agent who offered her a hamburger. Osman was not replaced with a clone as ONI decided no one would notice. Osman failed the augmentation process and was recruited into ONI. Considered a "protege" to Admiral Margaret Parangosky, the Commander in Chief of the Office of Naval Intelligence, she groomed the former Spartan for a potential future as her successor. She is known for her 'in-your-face' way of answering people.

She was hand picked by Parangosky to lead a diplomatic mission to Sanghelios after the war. For the mission, she was paired with the AI Black Box. At first, she reacted to the eccentric AI with wariness and suspicion, but learned to trust him over time.[3] Serin Osman and her crew had to respond to Venezia to help the UNSC Ariadne evacuate. When Venezia refused to help, the Ariadne was destroyed when the reactor blew up, she vowed to come back and get revenge. Afterwards she aided in the arrest of Catherine Halsey.

Later when Evan Phillips is caught in the cross fire of the Sangheili Civil War she returned to Sanghelios to save him. When she arrived, the Sangheili civil war erupted. When the UNSC Infinity arrives to aid the Arbiter, she must save 'Telcam and even the odds between the two sides.

After the destruction of Pious Inquisitor and a report to Admiral Parangosky, Osman decided to check her files prior to the SPARTAN-II Program. After learning the details she decided to go to Cascade and visit her former teacher while the rest of Kilo-Five went on shore leave on Cascade.

As of 2558, Osman had been promoted to Admiral and Commander in Chief of ONI, replacing Admiral Parangosky. During the Second Battle of Requiem, the artifact that had been recovered from Requiem and brought aboard the UNSC Infinity began to warp Promethean Knights aboard the ship. During the battle onboard Infinity a single Promethean Knight kidnapped Catherine Halsey. After this occurred Capt. Thomas Lasky contacts Admiral Osman, where she then orders him to eliminate Dr. Catherine Elizabeth Halsey as her predecessor had wanted.



  • Admiral Osman has a personal agenda against Dr Halsey, after being given Dr Halsey's personal notebook describing in depth all the actions she undertook in developing the SPARTAN-II program. This would help explain why Serin and her predecessor, Admiral Margaret Parangosky, have such a close relationship.
    • This may also be due to resentment from washing out of the SPARTAN-II Program.
    • She is the only known SPARTAN ever known to hold a flag rank.
  • One of only a few SPARTAN's, if any, who does not see Dr Halsey as a mother figure or as a person of authority.
    • This may be due to her failing the augmentation process and being discarded by Dr Halsey as a 'reject', causing her to turn to others, such as Admiral Parangosky, to whom the latter fueled this anger into hatred towards Dr Halsey.
  • She is the first SPARTAN washout portrayed in any of the games.



  1. 1.0 1.1 Halo: Mortal Dictata, Chapter 15
  2. 2.0 2.1 Halo 4: The Essential Visual Guide – page 26
  3. Halo Waypoint — 343 Sparkast #5

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