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Probably a simple intro line saying "examples on this page will contain Late Arrival Spoilers" will suffice.
A Late-Arrival Spoiler is when the trailers, merchandising, and other officially released information spoil a secret. If that character's presence in the game has not been featured in any official ads or the like, then I'd say that we ought to consider it a spoiler.
Edit: After double-checking the page, yeah, it's a Late-Arrival Spoiler. Nintendo didn't care enough to not spoil her presence in the game before they released the game, so they probably considered it more like a reward at the end of the main story rather than something to keep a secret.
Edited by WaterBlap Look at all that shiny stuff ain't they prettySorry, I wasn't exactly explicit in what my opinion was. I think there should be a line saying "Examples on this page will contain Late Arivial Spoilers," and if it's necessary, you could also include a sentence explaining Nintendo revealed that spoiler before the game was ever released.
Look at all that shiny stuff ain't they pretty

On the Super Mario 3D World page, is Rosalina being playable considered a spoiler anymore? Some examples spoiler them and others don't.