>still the best Keith Moon-type drummer in the world - A
>paraphrase of something the late Keith Moon (drummer for The Who and a
>particular idol of Ritsu's) said to reporters once.

So if the Visual Novel production company Type-Moon named one of their characters Keith Drummer*, that would make him... still too much of a stretch for this joke to be funny in any way.

* they named one of their characters Bazett Fraga McRemitz, I would not put it past them.