GUMI (グミ) is an official mascot character of Megpoid (メグッポイド /
Meguppoido) which is a singing synthesizer application software powered by Yamaha's Vocaloid2 and was published by INTERNET Co.,Ltd. The name GUMI is from the voice provider Megumi Nakajima's nickname in her childhood.
[1]
The naming about this product is very confusing. The Vocaloid software itself is under the official name Megpoid, and GUMI is the avatar character of the software drawn by the illustrator Masami Yuuki (ゆうきまさみ Yuuki Masami).