- Yo-kai Watch: Main game series, spin-offs, and mobile game:
- Yo-kai Watch animation: Major Yo-kai
A pale green feminine seaweed creature with big dark brown eyes and tiny pink blushed cheeks. She has a dull red ribbon tied around the top of her head to match the pants she wears. Over the chest are white bandages, along with a loose pink jacket accented by white.
In the anime, Wiglin, Steppa and Rhyth are seen together, being collectively known as the "Yo-kai Dancers".
Also, on a Baffle Board in Yo-kai Watch 2 and her Yo-kai Medallium bio, it says she is loved by Wiglin and Steppa, but she is not interested in either.
In Yo-kai Watch 2: Shin'uchi, Wiglin is the center of a sidequest involving all three of them.
Rhyth appears in shallows at Rolling Waves Park (Downtown Springdale).
Rhyth appears in Seaside Cave (San Fantastico) or in a Globe Gate of Whimsy.
Yo-kai Watch Animation Series
Rhyth debuts in EP013 along with Wiglin and Steppa, in which they cause Nate to be able to dance when previously was not able to. While initially grateful, Nate quickly curses this new ability when it takes him to the extreme by causing him to dance even in inappropriate situations. Sometime after this, the Yo-kai Dancers give Nate their Yo-kai Medals.
- Loafing: "Not feelin' it..."
- Receiving food (favorite): "It's perfect!"
- Receiving food (normal): "Curious flavor."
- Receiving food (disliked): "Noooo!"
- "Mekabu-chan" comes from mekabu (和布蕪), thicker wakame leaves cropped near the stalk.
- "Rhyth" is a corrupted form of the word rhythm.
- In German, "Tschatscha" consists of the word "tscha tscha" which means "cha cha".
- In Spainsh, "Ritma" is a corruption of ritmo (rhythm).
- Rhyth along with Wiglin and Steppa are the only Yo-Kai capable of equipping "Cheery Coat"
- Although Rhyth grabs both the attention of Steppa and Wiglin, she is interested in neither of them.
- There is a mistranslation in Yo-kai Watch Blasters where she, Wiglin, and Steppa instead of saying the "Dancing Trio" in their introduction say the Japanese group name "Triple Sea"
In Other Languages
- Japanese: メカブちゃん Mekabu-chan
- Korean: 미역뿌리양
- Spanish: Ritma
- Portuguese (Brazil): Bailalga
- German: Tschatscha
- French: Salsalga
- Italian: Tanz
- Chinese: 海草妹妹 (HK) or 海藻妹 (TW)
- Thai: เมคาบุจัง
- Arabic: عبيلة