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Wasn't the Charizard page deleted for doing this stupid nonsense?
... yep. At least that was in the right namespace, though.
I would like to contest this for the following reasons:
Here are a bunch of early reactions to Groot's page. People seemed to like it. Pikachu's page might be different (largely due to Pikachu itself being less unanimously liked than Groot, I presume), but in my opinion, I don't think either page should go unless they prove to be unpopular in some way (lack of edits/views, constant flaming, tropers voting against keeping the pages, etc.) Pikachu's page was also inspired by its Uncyclopedia page, which I personally found hilarious.
What does make sense, though, would be to move them back to the Self Demonstrating namespace instead of their "joke" namespaces (which I just did), and also deleting Main/IAmGroot because it only exists for the sake of a one-off, hard-to-spot joke. Everyone so far has objected to the joke namespaces, so they were pretty easy to change back (they're redirects now).
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How well does it match the trope?