'Hand him a book and he'll bury himself in it. He's never been interested in a formal career because he's too busy learning. Chastity has always been able to convince him to put down the book and dance.'
Gabriel Green is a Knowledge Sim and he lives in Belladonna Cove. After his father's death he moved out to a new place with Chastity Gere who became his roommate. He works as a convenience store worker. At the beginning of the game, Gabriel may very well have a romantic preference for his best friend, Samantha Cordial. If you have a Sim move into a lot close to the lots were they live, it will most likely be that when they welcome you to the neighborhood, one of the two will perform a romantic interaction. Then, they will fall in love on the scene. Also not found in his appearance, he has eyeliner and light lipstick. Oddly he has no memory of aging to a teen and apparently he had the first kiss as child and by his memories he would be a teen now though that is not possible in normal gameplay, this may have been a mistake made by developers, or a glitch.
If a sim looks through the telescope during the day, Gabriel will shove him or her for spying, but will always look at the camera and protest before doing so, as sims with lots of nice points tend to do when given a command by the player to engage in a mean interaction.