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Oniou Rasen (Japanese: 鬼王・羅仙 Oniō Rasen) is an SS Rank, Boss Yo-kai of the Wicked tribe.

He is the main antagonist in Yo-kai Watch Shadowside: Return of the Oni King.



Onion Rasen is a silver overweight Oni with grey armor.

In his De-Armored form, he loses a few pounds. His speed has also significantly increased.

In his Fragment form, he resembles a four-armed shadowy figure.


Yo-kai Watch Shadowside: Return of the Oni King

Oniou Rasen is known as the most dangerous threat to the Yo-kai World of all time. The Onimaro Leader uses Touma to bring Oniou Rasen back. He is first seen crashing down from the Onimaro meteor and lands in a neighbouring forest. After Touma is cured by Natsume and Kitaro, he emerges from the forest, cutting down a skyscraper with his sword and building himself a throne, before absorbing every Onimaro on Earth, including the Onimaro Leader, with the exception of Ogu, Togu and Mogu. Oniou Rasen is killed by Fudou Myouou and Yami Enma.

Game Data

Yo-kai Watch: Wibble Wobble

Stats Calculation
Soultimate Move
Other Effects
Soultimate Levels
LV01 00
LV02 00
LV03 00
LV04 00
LV05 00
LV06 00
LV07 00
Skill Levels
LV01 Effect: 00
LV02 Effect: 00
LV03 Effect: 00
LV04 Effect: 00
LV05 Effect: 00


His name translates into Oni King Rasen (Japanese: 鬼王・羅仙 Oniō Rasen).


  • When he gets beheaded by Touma, he manages to stab Touma with a fragment of his blood, which is a reference to Shuten doji from Japanese mythology.
  • A fragment of his which appeared in SS022 went by the name of Kabila.
  • He is the second Boss Yo-kai after McKracken to share the same name on both forms (both their names of their second form are unchanged).
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