Artist, illustrator.
His nickname came from 卵黄 (ran'ou, lit."yolk").
卵の黄身 (Tamago no Kimi, lit."the yellow of an egg") was originally used as a qualifier of his nickname. However, he also uses it as his username.
Japanese name: らんおう [Ran'ou] or らんおう@卵の黄身 [Ran'ou (Tamago no Kimi)]
Circle name: 発酵戦隊
Site name: EGG BREAKER