Having Johnny ride around in Miku's head would be amazing. I mentioned elsewhere in this thread (ye gods, a YEAR ago?) that there's a quest later on helping out some J-pop idols. Listening to Miku give advice to the three Us Cracks girls would be precious.

Starting with, "I don't care how many eddies Kiroshi is paying you, those eyes look fucking stupid."

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Authors of our fates
Orchestrate our fall from grace
Poorest players on the stage
Our defiance drives us straight to the edge