There, done. That wasn't such a chore now, was it? Sometimes, I just need some rest to not screw up those numbers.
For the sake of peace & quiet, in the majority of instances - but not all - cartoon characters are not artists, but their seiyuus, uh, voice actors are. This is a golden example of that sort of thing.
The exceptions are usually toons with a long history who've had multiple, non-"big name" voice actors - Mickey Mouse & other older (& more popular) Disney characters, most of the Muppets, certain Hanna-Barbera toons - that sort of thing.
Paul Frees was another one of those "men of a thousand voices" like Mel Blanc, Thurl Ravenscroft and...others that don't spring to mind right now, so he counts.
Again, this is all about making artists & tracks easier for site visitors to find. It's bad enough that people now go to YouTube to find these things rather than search us out first. Getting it perfectly right = good. Getting it right AND making it easier to find = better.