Vecchietta, identified in source material as "Old Woman," "Old Beggar Woman," or "Granny," is an elderly human living alone under impoverished conditions within a small wooden cabin. Her exact background remains undefined.

Her story unfolds when she encounters and shelters Chao, an abandoned cat searching for purpose. She becomes Chao's caretaker and sole companion. Chao, however, mistakenly believes her to be a witch capable of granting wishes, a misunderstanding that defines their dynamic as Chao hopes to learn magic and become human.

Midway through their shared narrative, she falls severely ill following an implied physical altercation involving antagonists such as Baron Ghost. Her condition deteriorates into a life-threatening state, confining her to bed. During this crisis, Unico secretly employs his healing abilities to cure her, aiming his horn discreetly through cracks in the cabin walls. Her recovery happens offscreen after this intervention.

Her restored health directly catalyzes Chao's character growth. Witnessing Chao's selfless act to save her from drowning—a display of genuine compassion—motivates Unico to permanently transform Chao into a human girl. After this transformation, Vecchietta continues providing shelter and stability. Chao chooses to remain living with her in the cabin, establishing a relationship of mutual support and caretaking.

Her role concludes with this enduring arrangement.