# JavaScript ES6, <s>85</s> 78 bytes

As an anonymous function

    a=>["Blinky","Inky","Pinky","Clyde"].filter(c=>!a.includes(c)|a.some(v=>v[6]))

Today I learned about this `filter` function. Fun!

15 bytes saved thanks to Neil.

Usage:

    (a=>["Blinky","Inky","Pinky","Clyde"].filter(c=>!a.includes(c)||a.includes("Pac-Man")))(["Pac-Man"])
    > ["Blinky","Inky","Pinky","Clyde"]
    (a=>["Blinky","Inky","Pinky","Clyde"].filter(c=>!a.includes(c)||a.includes("Pac-Man")))(["Pinky"])
    > ["Blinky","Inky","Clyde"]
    (a=>["Blinky","Inky","Pinky","Clyde"].filter(c=>!a.includes(c)||a.includes("Pac-Man")))([])
    > ["Blinky","Inky","Pinky","Clyde"]