I just discovered....

Muraki Kazutaka shares the same seiyu as Nanjo Koji!
They're both psycho, silver haired men!
(And are both unhealthily obsessed with another guy)

Hayami Shou~♥

He is also Ginias Saharin from Mobile Suit Gundam: The 08th MS Team

AND... Oda Nobunaga from Samurai Deeper Kyo!

And he voices Akechi Mitsuhide in Sengoku Basara and Izuma Rutsu in Phantasy Star Universe.
♥ ♥ ♥

Not to mention he voiced several characters in the Transformers series.
His voice can bring world peace. I swear.
I would rate him with Koyasu Takehito (♥!)

Not enough hearts to go round in this post.