Kenji's seiyuu is Seki Tomokazu, who also plays various other roles in various other anime. Here are a few roles that stood out for me at least. (With pictures! ^.^)
Van in Escaflowne..
Ken in Weiss Kreuz...
Kamui in X....
Sakura's brother Touya in Card Captor
Sakura...
Chichiri in Fushigi Yuugi...
Suzuhara Touji in Evangelion...
This is only a sample of his roles tho... ^.^
Yes, he's also in Voicelugger, a sentai-like live action show... Servo-Z is a big sentai fan!!! ^__^ I'm on the lookout for where I can get this, then I'll have screencaps of Seki Tomokazu here.. Until then, enjoy this picture, he's the one in green:
Oh... Maybe you want some info on who does Tracey's voice? Well, that would be some guy, I forget his name, who does almost all the other male characters in the show (at least half) including Brock. I don't care.