Who is the most-connected (in the "six degrees" sense) seiyuu? A lot of you probably know about Kevin Bacon and how he's supposedly the most connected among Hollywood artists.


  Who is the most-connected anime voice actor (seiyuu)?


I've seen in some places that either of Yuji Ueda or Megumi Hayashibara could be the Kevin Bacon of seiyuu, but has anybody ever done the graph of the interconnections between voice actors to support this claim?

(I'm only counting voices in the original Japanese, and not dubs.)
I don't know the specific answer for "most connected" seiyuu, but many companies did some ranking for seiyuu.

Oricon (Japanese) has a user-vote based ranking. Most known seiyuu is Nobuyo Oyama (e.g. Doraemon) and Masako Nozawa (e.g. Goku from Dragon Ball).

AppBank (Japanese) also has a ranking based on votes from other seiyuu. Top 3 is Koichi Yamadera, Masako Nozawa and Keiji Fujiwara. I think Yamadera is selected because there are lots of seiyuu worked with him.

I want to put my 2 cents to Koichi Yamadera because he has long career and variety of anime.