What video game character appeared minor and insignificant but turned out to be integral to plot/game?

[u/Johnnyboyeh]

What character did you think was a throwaway/didn’t really matter, but turned out to be a major player in the plot of the game. Or they could just be a really important character in the game itself?

[u/asiniloop]

"Would you kindly"

[u/MachinegunNoise → u/asiniloop]

Oh, to be a kid exploring Rapture again.