Time Extension recently did an interview with Leslie Swan and she claims to have voiced 9-Volt in addition to Mona (I assume in all the pre WW Gold games?)
Recently Time Extension published an interview with Leslie Swan (who used to be localization manager at NOA and voiced Mona in the pre WW Gold games, among other things) and basically, she explains the reason why every WW character was voiced by rando Treehouse staff is that the WarioWare team...
There are some services that let you assign multiple images to an URL.
I don't remember which one I used since my signature's been the same since 2014. I *think* it might be Signavatar..?
@warelander let me in on this little-know fact: Wario Land Shake It's Producer at Nintendo Takahiro Harada was interviewed in the November 2008 issue of the German mag "N-Zone" and in one of the questions, he lets out Good-Feel had "a concept" for a new Wario game for both Wii and DS...