Born in 1942 in Nagoya to a family of sword appraisal experts, Toyoba Seiya began his journey in craftsmanship by studying woodworking at Nagoya City Crafts High School. He then apprenticed with Arakawa Toyozō, the celebrated potter recognized as a bearer of two Important Intangible Cultural Properties: "Shino" and "Seto Black." Under Arakawa’s guidance at the Suigetsu Kiln and the Ōgaya studio, Toyoba refined his skills, embracing the techniques and aesthetics of traditional Japanese ceramics. In 1974, Toyoba established his own kiln, an anagama (or climbing kiln), at the Ōgaya site in Kani City, embarking on an independent career that has been marked by numerous solo exhibitions. In recognition of his mastery, Kani City designated him as the holder of the Important Intangible Cultural Property for "Seto Black" in 2018.

Toyoba’s pieces radiate warmth and embody his gentle character. The forms he shapes on the wheel, combined with the organic effects of natural wood firing, reflect his joyful, humble approach to pottery. His work spans two main types of utsuwa (vessels): tea ceramics and functional ware. Drawing from the natural beauty and daily life of the Ōgaya area, Toyoba employs a range of techniques, including Seto Black, Shino, Yellow Seto, Powdered Glaze, and Karatsu, each celebrating a distinct aspect of Japanese ceramic tradition that has deep roots in Korean glazes.