Zabuton

Zabuton (ザブトン), also known as Harbinger of Death and Illegal Demon Spider, is a demon spider who came to Hiraku's farm and mother of Makura and Arako. With the offer of being able to provide the source of fabric products (e.g. clothes) in exchange for making a home in his giant tree that dominates the center of his farm, Zabuton acts as the main seamstress and lookout for the farm and later village. She also has many offspring who aid the village.

Graffalun
They are old friends, although not much detail is given. Zabuton helped her to avoid Hiraku's spear attack by wrapping her with her web.

Hiraku
Master-pet relationship. She willing to obey and defend her master.

Trivia

 * Zabuton (座布団) means sitting cushion. She was named after that after Hiraku first impression of her look.
 * Zabuton likes potatoes.
 * One of the recurring gags is that those visiting the village for the first time faint at the sight of Zabuton, which is something of a "rite of passage" in the village.