#7 Kei Tomiyama
One of the classic anime voices of the 70s and 80s, Kei Tomiyama's tragically short life was nevertheless fruitful in his industry. Already well-known by the seventies for his role as the wrestler eponymous Tiger Mask, an character who has endured as an anime icon for decades, he went on to play a few other very notable roles. His tender, sincere voice at times belied his often firey delivery.
Something a bit less controversial:
#6: Masako Nozawa
It's hard to imagine a voice talent who delivers with more warmth, charm, and sincerity than Masako Nozawa. Though she's basically well-known only for a single character (and his look-alikes), it's that one iconic role and equally iconic performance that makes her worthy of highlight. That role, for those of you in a cave for the past twenty four years, is Son Goku from Dragon Ball/Z/GT.