Miyabi is a fair-skinned girl around Mana's age and height with straight, dull green hair that has a lock hanging between her eyes, which have dull violet irises. Her school uniform consists of a white long sleeve collared shirt, with a medium length teal skirt and matching tie, short white socks and brown tipped shoes. During the colder seasons, she wears a light teal, long-sleeved jacket over her collared shirt. Her casual attire usually consists of an orange T-shirt, with a yellow trim and a single yellow horizontal stripe in the middle, olive green shorts and brown strap sandals.
Episode Three: Miyabi first appears in the third episode of the sixth anime adaptation, Tantanbō's Yōkai Castle. She is seen with Mana and another student when their class was touring a facility that was being constructed.
Episode 15: Miyabi appears in episode #15, Zunbera Spirit Surgery. In this episode, she and Mana spot Kirara while walking home from school. After Kirara undergoes Spirit Surgery, Miyabi is among the many students who are surprised by Kirara's new appearance.
Episode 25: Miyabi appears again in episode #25, Kubire-Oni's Curse. After Mana receives a heartless message on the RAIN messaging app from their classmate Karin Yamane, she talks to Miyabi about it the next day. Miyabi suggests that Mana can get her revenge by using a cursed app. Miyabi then downloads the app for Mana soon after.
- The name Miyabi means "elegant, graceful" (雅 Miyabi), while her surname, Momoyama, means "peach" (桃 momo) and "mountain, hill" (山 yama).
|Inuyama-Sawada Family||Mana Inuyama • Junko Inuyama • Rie Inuyama • Shōji Inuyama • Toshiko Sawada • Yūichi Inuyama|
|Mana's Friends||Aya Ishibashi • Himeka • Hiroto • Miyabi Momoyama • Sōma • Yūta|
|Sōkai Apartment||Aki • Fuyuko • Haruo • Natsumi|
|Sakaiminato||Kadonaga • Kinopi • Rie Inuyama • Shōji Inuyama|
|Other Youths||Arimoto • Masashi Uchida • Tōma • Tsutomu Takagi|
|Young Adults||Atsushi Kitajima • Natsumi • Shun • Yayoi Kuzumi • Yuna Yamamoto|
|Other Adults||Akinori Uchida • Shō • Sumitomi • Yuna's Mother|
|Elderly||Masae • Michiko & Farmer|
|Others||Company Boss • Gōhara • Hiro • Mammoth • Rodriguez Bebe|
|One World Adamas Syndicate||Nakamura|
|Onikubo Family||Aiko Onikubo • Kozo Onikubo • Yusuke Onikubo|
|Youths||Gōhara's Daughter • Hina • Karin Yamane • Kirara Fusano • Kazuki • Mikoto Onozaki • Tōma • Yumi Okakura • Yūsuke|
|Young Adults||Charatomi • Hikkakin|
|Adults||Akimura • Gōhara's Wife • Hina's Mother • Kariman Foresty Foreman • Kotani • Paulo • Shōgo Onozaki • Yuriko Igarashi|
|Elderly||Mr. & Mrs. Ogata • Uchimura|
|The Batteries||Alkaline Yuriko • Nickel Kana • Manganese Ayana|
|Kidōshū||Rei Isurugi • Saya|
|Government||Minister of Defense|
|Past||Fuku • Kumiko Dote • Princess • Soujiro • Torakichi|
|Deceased||Kunishige • Shiota • Sugimoto • Shibazaki • Tsutomu's Mother|