Nestor is a minor character in Cobra Kai.
Nestor is the Spanish shopkeeper in the Reseda Strip Mall and he often speaks to Miguel in Spanish.
Nestor appears in Ace Degenerate when Johnny buys pizza from his shop. Johnny insults him and Nestor makes an insult back in Spanish about Johnny to Miguel. Johnny asks Miguel what he says and Miguel tells him and Johnny thinks Nestor can't speak English and tells Miguel to insult him. Nestor says he speaks English and Johnny then throws the money he pays for his pizza on the floor and snatches it off Nestor. Nestor appears again in Different but Same where Hawk buys beer with a fake ID that his tattoo friend Rico printed off for him and Nestor believes the fake ID is real thus allowing Hawk to buy the snacks and the beers for the planned crash of Yasmine's birthday at the Canyon as revenge.
Nestor does not appear this season, nor mentioned but it is likely he still rents out his convenience store.