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You know King and Emily love to show up fashionably late
Probably an expansion but Nintendo really needs to start giving Splatoon spinoffs like they do Mario and Zelda.
Hell, even Metroid has gotten like 3 spinoffs. It's one of the keys to Nintendo's IP strength and longevity.
Nintendo has to start doing spinoffs. Like you said the IP is big and Mario and Zelda have spinoffs. Splatoon is in this realm.