An Original character by Rakurakutei Ramen. A "recently" reborn female dragon who's taken the form of a young human girl with short Blue Hair and a lumpy Single Horn growing from the left side of her head. When sufficiently agitated, she can change her arm into that of her dragon form, punching with great strength or wielding mauling claws.
Tamaryu lives at the Karindou shop with her "sisters" Kinka and Ginka, and adoptive "mother", Seren.
More recently, she's often seen hanging around with Kagurazaki Shizuki and later Ran Straherz as part of a new "Holy Trio", and as students at a new school for Youkai. During the course of the series, she begins receiving mentorship under Tatsuta Rindou of the "Holy Trio".
Apparently, the author previously planned releasing a game starring Tamaryu, Shizuki, and Meguru defeating a secret society together, but it was never actually released. Nevertheless, it is the backstory of how Shizuki and Tamaryu met in the comics, although the exact details are never fully explained.