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25 years after the end of the Locust War, Oscar was relied upon by Reyna to protect and train the people in her village.
Oscar accompanied JD, Del and Kait to a COG settlement that was being under construction to raid a fabricator needed for the village. They went through several areas undetected, avoiding the Watchers until one caught them. When the Watcher called several Shepherds to escort them off the premises, Oscar shot the first one that addressed them, as he did not like being called a citizen when he was an Outsider. They fought their way through the settlement, where Oscar stayed outside to guard JD and Del who went inside to grab the fabricator. Much to his disappointment, Kait also went with them.
He is later captured by two DR-1s, but a transport smashes through the DR-1s and Shepherds, and is quickly freed. Back at the Outsider village, Oscar helps organize a defense against the COG who were attacking the village for kidnapping people. Oscar would be recruited to help find out who was kidnapping people, but in the following night, mysterious creatures raid the settlement. Oscar tried to fight the mysterious creatures off but was kidnapped by one of them. 
In the game's ending, Oscar managed to kill the Snatcher that was carrying him, freeing himself. However, he does not know where everyone went.
Personality and Traits
- "I'm more of a shoot-than-salute kind of guy."
- — Oscar Diaz
Oscar was a boisterous and opinionated warrior who, along with being annoyed at JD and Del's smugness, resented them for leaving the Coalition of Ordered Governments, believing they abandoned their duty as Gears. It is also shown that he does not like the "tin soldiers" that the COG were using. He also has a love for wine and women.
Behind the scenes
- Oscar is a playable multiplayer character for the COG in Gears of War 4. He has five unlockable character skins: Color Blast, Day of the Dead, Outsider, Vintage, and Zombie. The Vintage Oscar character skin is only available as a code found in Gears of War 4 Limited Edition Xbox One S bundles.
- Gears of War 4 (First appearance)