A Nijisanji virtual YouTuber, part of the group Idios and designed by Toosaka Asagi.
See post #5998989 for the reference sheet.
She is portrayed with long orange hair with an ahoge and tied into twin braids, green eyes, and small breasts.
The following tags implicate this tag: shishido_akari_(1st_costume) and shishido_akari_(casual) (learn more).