• "One Piece" 1021 is titled "Demonio"
  • The upcoming manga installment releases Sunday
  • "One Piece" 1021 could offer updates on the fight between Nico Robin and Black Maria

"One Piece" 1021 spoilers tease surprising character transformations of Nico Robin and Kozuki Momonosuke that could impact the war in Onigashima.

The latest set of spoilers for "One Piece" 1021 is now available online, thanks to Redon of AP Forums and other insiders in the community. The upcoming manga installment teases two major character transformations that fans did not expect. The first major transformation will reportedly happen to one of the most underrated Straw Hats crew, Nico Robin.

It appears that fans will see the archeologist use a new technique, called Demonio Fleur, in the upcoming chapter. According to spoilers, using this technique will allow her to transform her giant body into a black demon. The transformation is a welcome change, especially for Nico Robin fans who have been aching to see her in action.

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Some fans believe Robin is very strong but her abilities were nerfed over the years. A black demon with an imposing size is a perfect match against Tobi Roppo's Black Maria. The Shinuchi is as large as Kaido and is 8.2 meters tall. Robin in her standard form is no match to this powerful monstrosity.

The spoilers also mentioned that before her transformation, Robin had a flashback involving Sabo, Koala and Hack. During time-skip, Robin spent her time with the Revolutionary Army, where she trained and got close with its members. "One Piece" 1021 spoilers also mentioned the possible character transformation of Oden's son, Momonosuke.

At the end of the chapter, Momo would reportedly ask Shinobu to turn him into an adult using her Juku Juku no Jutsu on him. Shinobu has eaten the Paramecia type of Devil Fruit called Juku Juku no Mi. As a result, Shinobu has the ability to mature and decay inanimate objects.

It is possible that Momo has become frustrated with the way things are happening in Onigashima. He left Kinemon and Kiku believing that both are already dead. Momo's request to Shinobu is probably triggered by frustration, guilt and desperation.

Interestingly, Shinobu's devil fruit seemingly works on inanimate objects only. While it remains to be seen if her power works on a human being as well, seeing an adult Momo could impact the war in Onigashima.

The samurai may be inspired to see their lord fight with them. It could also confuse them since most of the fighters saw Momo as a child before the war started.

"One Piece" 1021 is set to release on Sunday. The upcoming chapter is titled "Demonio."