First Mayumi Tanaka (Luffy) and now Kappei Yamaguchi (Ussop)
http://www.animenewsnetwork.com/news/2010-04-13/north-carolina-animazement-to-host-kappei-yamaguchi
For those in the North Carolina area, heads up! May 28-30 in Rayleigh(pun intended), North Carolina.
One other note is that Richard Ian Cox will also be there, for Inuyasha fans this could be a unique thing if Kappei and Richard end up on the same panel somehow.