Akikoloid-chan

Akikoloid-chan (あきこロイドちゃん) is a Japanese VOCALOID licensed to Lawson, Inc., and as a "private" VOCALOID, she is not commercially distributed. Her date of debut was on September 13, 2011.
YAMAHA Corporation officially lists Akikoloid-chan as the first VOCALOID3 vocal in their VOCALOID timeline.