Puckman
(a.k.a.) Pac-man
Arcade release
Developer: Namco
US publisher: Midway

Created by Tohru Iwatani, this was the game which, to coin a phrase, started it all. The hero was named "Puckman" evidently due to his shape. Before its release in the United States, the title was changed to "Pac-man" because "Puckman" was an easy target for vandals to convert into a vulgarity. It introduced the yellow hero along with the four monsters
The monsters' original movements were pre-defined at first. People racked up ridiculous scores when their movements were memorized, so a later version of the game gave the monsters more random movement, each with their own personalities.
The Red monster is Oikake, "Chaser." This is the monster players will most often find on their tail throughout the game. Nicknamed Akabei, "aka" being Japanese for "red." Also known as Shadow or Inky in the US.
The Blue monster is Machibuse, "Ambusher." His strategy is to head toward the opposite end of whatever tunnel Pac is going through. Nicknamed Aosuke, "ao" being Japanese for "blue." Also known as Bashful or Blinky in the US.
The Pink monster is Kimagure, "Whimsy." His US name is Speedy, though he's not the fastest monster (Akabei is). He just goes in the general direction Pac is located. Nicknamed "Pinky" in both Japan and the US.
The Orange monster is Otoboke, "Plays dumb." He goes in random directions that tend to gravitate toward Pac. Nicknamed Guzuta, "gu" being Japanese for "stupid." Also known as Pokey or Clyde in the US.
Obviously, the Orange monster was originally meant to be the dumbest of the four, and the Red one was the smartest. The Hanna Barbera producers obviously didn't notice this, making Clyde the LEADER of the four in their cartoon.
The original design for Pac-man outside the game is pretty much the same as it is now, except he had a really large Pinnochio-like nose. This was the Japanese design, of course. The US design was COMPLETELY puzzling. I'm not sure how the artists at Midway managed to picture Pac as a little yellow guy with two big feet and a deranged grin on his face.