alicia_solid
Niconi Solid's mascot character.
She was designed by Kuroboshi Kouhaku(post #2018411) and her official 3D model data was created by Ukoku Kei.
Official name as a mascot: ニコニ立体ちゃん (Niconi-Rittai-chan)
The character's human name: アリシア・ソリッド (Alicia Solid)