User blog:Hyperus18/Coco's Graduation: An In-Universe Explanation

A child dragon (3,500 years old is young in dragon years) who is fond of human culture. She traveled from another universe to ours, just to study Japanese in a random language school.

Also an honorable and heroic dragon who is filled with justice. Despite trying really hard to keep her human form, she failed to do so, thus graduating from Hololive and going on to become a dragon who desires to help Japan, and eventually our world and her original dimension.