Sorry. I lied. Ritsu's a creation by the folks at 2ch, the people who made Teto and Ruko. It's another one of their tricks to fool people into thinking that there's a new Vocaloid.

Another thing: Ritsu's a guy. Yes, as Admiral Akbar famously exclaimed, "it's a trap!", the same phrase can be applied here with Ritsu. I'm guessing earlier on, some artists didn't realize that Ritsu was a guy, and added breasts. Of course, that's explained here.

The folks over at 2ch might not be so far off though, as there's supposedly a new Vocaloid in the works by Crypton, the ones who brought us Miku, Rin/Ren, and Luka. This one's a male Vocaloid, with voice sampling supposedly from a 'young popular seiyuu'. More details over at ANN.