Red is the default name for the protagonist of the first generation Pokémon games. He does not have his own lines during the entire game, and other NPCs infer Red's situation from the items he has or other things that might show what Red wants.
In the second generation of Pokémon games, he is the hidden final boss of the game. His only line in the second generation games is "......". As such, many Pokémon fans consider Red as a cool and chic, silent character.