Welker really is everywhere!!
Also, Matt Hill and Jason Gray Stanford were in TMNT: The Next Mutation... I need to go listen to their voices again to see if I can hear them. Ryo and Kento! *squeeeeees*
Of course, Jason Gray Stanford can disguise his voice apparently, because he was a semi-regular on Monk and I couldn't hear that voice I know and love. *cries*
Edit: Okay, I can totally hear Ryo in Matt Hill's Raph, it's a little disguised, but definitely there. XD Jason Gray Stanford is very hard to hear in Donatello, but! He cannot seem to disguise the roughness(?) in his voice as he talks. Either that or hitting that pitch for Don is a strain. Still prefer 03 Don and Raph. *watch out for that puddle of wolf drool*
Eric Stuart's another voice actor that's everywhere. He was in the 03 TMNT series, though as an extra and not anyone named (he was in the good Yu Yu Hakusho movie too, squee! Koenma~! need to get my grubby little paws on that).
Lisa Ortiz is yet another voice actor that seems to be found everywhere (either that, or she's stalking Eric Stuart from show to show, bwahaha). Of course, it's really hard to miss when she's used. Talk about distinctive voices.
*goes to drool over smexy voices*