There's a quest later on that involves anime idols, but not a Vocaloid. so far as I know.
Don't get me wrong, I actually appreciate what they did with Johnny Silverhand and if you handle it right he -does- mellow out some. But...yeah. A mod that changes him to that jaded, dry-humor Haku Mitsune would be hella awesome.
Set the whole piece to Fleet of Fog-era Earth...
Authors of our fates
Orchestrate our fall from grace
Poorest players on the stage
Our defiance drives us straight to the edge