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As of now, there is no way to get Arataki Itto from any of the Standard Banners.
Itto can gain a maximum of 5 stacks of Superlative Supertrength at a time.
This may have influenced Itto's vigorous, kabuki-esque costume, most notably , or red makeup in his face.
This activity was suggested by Itto himself, and it entailed everyone standing on a cliff and singing against the ocean wind to express their innermost feelings and well-wishes for the future.