Michael Sullivan (Earth-4001)

"Alright, so feast your eyes on grade "A" classified non-licit intelligence vids I pieced together. Super pain in the ass to do but… so worth it."

- Michael Sullivan, after hacking into classified ONI files

Commander Michael "Sully" Sullivan (service number 26582-72839-MS) is a Section One agent of the Office of Naval Intelligence. He was one of few survivors of the Covenant's invasion of Circinius IV in April 2526. After graduating from an Officer Candidate School, Sullivan received an officer's commission with the UNSC Navy and was detailed to ONI's Section One.

History
The history of Michael "Sully" Sullivan is the same as his mainstream counterpart.

Personality
Generally energetic and cheerful, Sullivan tended to perform poorly in Corbulo Academy's training exercises. However, he did not seem to take any particular pressure over his performance, and instead devoted most of his attention and spare time for hacking classified transmissions on his dorm room's computer terminal. He had not formed a clear opinion on the UNSC or the morality of the ongoing Insurrection, and stated that he was relying on his education to get a better understanding as to the reasons as to why they were fighting. When interviewed in 2526, he stated that he would be unlikely to ever be able to take a life; as a result, he aimed to follow in his father's footsteps and become a researcher for the UNSC instead of serving in a combat-oriented role. Although the other cadets were often mildly annoyed by his antics, he was not as unpopular as Thomas Lasky, who was vocal in his opposition of the UNSC's policies on ideological grounds. After the Covenant attack, Sullivan began to show signs of breaking down, panicking over Dimah Tchakova's death and later questioning if the Chief would return; nevertheless, he retained his characteristic sense of humor and maintained his composure over the course of the battle.

After Circinius IV's fall, Sullivan retained his amicable and laid-back persona as a façade, even retaining his nickname "Sully" from his time in Corbulo Academy. However, witnessing the deaths of his friends and classmates at the Covenant's hands when Corbulo Academy was destroyed made him inwardly quite hardened and calculating. Sullivan's cold rationality and willingness to go to any extreme in Covenant War to stop his alien opponents unnerved his superiors in the UNSC Navy, but brought him to the attention of the Office of Naval Intelligence.