Onechanside (Japanese: ワンチャンサイド Wanchan Saido) is a new form taken by Yo-kai that only appears from DX Yo-kai Watch Arcane Model K toys, notably in Yo-kai Watch!.
Information[]
In the middle of a tight situation, the user of the Yo-kai Watch can activate a Yo-kai's hidden power called the Onechanside. They never know what to expect, though, for it can be good or bad.
This mechanic behaves similarly to the Shadowside mechanic, for the wielder of the Yo-kai Watch Elder needs to insert the Yo-kai Keystone and turn it the opposite way from the regular summoning. Then, they should tap the Yo-kai Keystone on the watch's interface.
List of Onechanside Yo-kai[]
Onnen Tribe[]
| Normal | Onechanside | ||
|---|---|---|---|
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| Blizzaria | Goku Fubuki-hime | ||
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| Blizzaria | Beach-hime | ||
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| Tsundora-hime | Hyogaki-hime | ||
Goriki Tribe[]
| Normal | Onechanside | ||
|---|---|---|---|
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| Venoct | Venoct Zhou Yu | ||
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| Blazion | Akachan Merameraion | ||
Omamori Tribe[]
| Normal | Onechanside | ||
|---|---|---|---|
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| Jibanyan | Sakuranyan | ||
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??? | 
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| Komasan | Komasan Family | ||
Mononoke Tribe[]
| Normal | Onechanside | ||
|---|---|---|---|
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| Jibanyan | Jibanyan (Multiple) | ||
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| Jibanyan | Sakuranyan | ||
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| Jibanyan | MMM Jibanyan | ||
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| Jibanyan | Everyone | ||
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??? |
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| Jibanyan | Everyone 2 | ||
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| Jibanyan | Rudy | ||
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| Manjimutt | Saitori-o-aita Jinmenken | ||
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??? |
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| Manjimutt | Police Officers | ||
Tsukumono Tribe[]
| Normal | Onechanside | ||
|---|---|---|---|
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| Robonyan F | Keita Type-F | ||
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| Black Dianyan | Black Tirenyan | ||
Uwanosora Tribe[]
| Normal | Onechanside | ||
|---|---|---|---|
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??? | 
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| Melonyan | Yubari Melonnyan | ||
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??? | 
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| Usapyon | Usapyon (American Comic Hero Style) | ||
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??? |
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| Usapyon | UMApyon | ||
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??? |
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| Usapyon | USIpyon | ||
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| Usapyon | USUpyon | ||
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??? |
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| Usapyon | UNIpyon | ||
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| Usapyon | UNApyon | ||
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??? |
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| Usapyon | YUBApyon | ||
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| Usapyon | UTApyon | ||
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??? |
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| Usapyon | UKApyon | ||
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| Usapyon | Giant Usapyon | ||
Mikado Tribe[]
| Normal | Onechanside | ||
|---|---|---|---|
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| Lord Enma | Lord Enma Awoken | ||
Trivia[]
- The Oni tribe is the only Yo-kai Tribe to not have a Onechanside form.
- It's possible that it may have been based on the Chance Spell (recently localized as Hocus Pocus) from the Dragon Quest games.