CosMo

cosMo is an utaite, though he's more known as a producer under the name Bousou-P (暴走P), known to produce high-speed songs. But still his "Magical☆Nuko Len Len" cover gained respectable 209K views, as of September 2012.

He is also an illustrator, and his main profession is an animator, as he introduced himself as "an animator and a computer music apprentice".

He is sometimes depicted as female and tagged as "cosMo (Mahou ShoujoP) (コスモ(魔法少女p))", an example being his cover "Matryoshka" or "Senbonzakura" (both duets with OwataP).

He seems to be friends with fellow producer-utaite OwataP, as they duet and do gaming videos together.

For more information on cosMo as a producer, please visit his article here on the Vocaloid Wiki.

Trivia

 * His Blood type is A.
 * He has a cousin called Nanashi (ナナシ) who is also an illustrator.