Blinky (the red ghost)
Inky (the cyan ghost)
Pinky (the pink ghost)
Clyde (the orange ghost)
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Correct Answer:
Inky (the cyan ghost)
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In the original Pac-Man (released in October 1980 as an arcade game in Japan), the red ghost Blinky was written to follow behind Pac-Man, Pinky is tasked with getting in front of Pac-Man, Clyde would sometimes behave as Blinky and other times wander off on his own, while Inky the blue ghost was intended to be unpredictable: he might behave as Blinky, Pinky or Clyde.
Also see: 50 Years of Video Games
The ghosts were described in Japanese as having the following character personalities:
Blinky: "Oikake" or "Chaser"
Pinky: "Machibuse" or "Ambusher"
Inky: "Kimagure" or "Fickle"
Clyde: "Otoboke" or "Feigned Ignorance"