So glad to see another Tiddlebird enjoyer of hollowtones origin. Hope you are enjoying this wonderful little thing you have begun !! My perhaps suggestion of a kind: Hollowblade Chronicles the Toneshog
day 7: hollow blade (i'm gonna be real i read the words "hollow blade" and got incredibly carried away drawing holly holding a badass knife. maybe this art is from a sonic unleashed type world where she transforms into a toneshog. anyways, thank you for the request!)