Everyone has their favorite Tetrimino in Tetris, as well as the ones we hate to see drop into the game. Players have long sense associated specific feelings with each Tetrimino, and according to Tetris creator Alexey Pajitnov, that's because each one has a personality.
“Every piece has a personality. The square guy is very rude and stupid, because it doesn’t rotate. My favorite is the J piece because it can be used in many different ways. There was a time when I tried to write a story based on all the pieces, but it didn’t come to anything. But maybe in the future. Tetris is a never-ending story, so there will never be a moment when a new project isn’t happening somewhere.”