KeldeoVic Mignogna last con I went to. I actually went straight up and asked him why he likes voice acting and why does he do voice dubbing even though it doesn't pay much. In fact, when I usually ask to get my DVDs signed at cons, that's usually what I ask. I wish I could have asked Kumiko Wantanabe more but it was like the fast checkout line. Then again, I doubt I would understand her and Keroro from Sgt. Frog is the only role of her's that I know well so I really don't regret being able to ask her anything (not that either of us speak each others tongue anyways).
Then there was the line for Monica Rial's signature which I got for the heck of it even though I'm not too big of a fan of her work. The only ones I really know are Momoka from Sgt. Frog and Tsubaki from Soul Eater; both of which are good but neither stand out or differ much from one another. What really disgusted me and further proves your point were the many people with Highschool of the Dead merchandise lining up for her autograph (with her performance in the show being horrid). I asked her how casting works and she told me that you have to love your second job and money is money. Not as inspiring as Mignogna who told me that he loves his job with so much more passion.
No less, out of all people who've signed my DVDs, the only one I truly admire is Mignogna who's a great actor. That's also why I answered Steve Blum as my favourite dub actor, he's downright awesome at what he does! Excuse me for using some American cartoons as examples but please let this slide. From his sinister yet cowardly portrayal of Starscream to his cool Spike Spiegel to his flamboyant Leeron Littner, the guy's amazing. Though if there's one performance that I have to give him a massive tip of the hat for it's the role of Wolverine especially in the episode of the Ultimate Spider-Man (I was curious and checking it out, the show's horrible) where the mutant and title character switched bodies, he nailed the show's portrayal of the web-head so well.