Mirai Sakura

Mirai Sakura is a retired witch who lives in the human world as a glass-blower. She first appears in Dokkan, where she met Doremi as she attempts to figure out what her future goals are. She would later reappear in Ojamajo Doremi 17, where it is revealed she is raising Yume, Hana's younger twin sister.

Mirai was a witch named Majo Avenir who retired and settled down in the Human World. She took the identity of a close figure to him and taught him how to blow glass, which she then took up as a job.

(Source: Ojamajo Doremi Wiki)