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Since you joined the wiki a few days ago, you must wait 4 days until your account is autoconfirmed to be able to create pages. As for the specific page you mentioned, I believe it is too early to create a page on "Arlo" since we likely won't see anything related to "The Good Dinosaur" until January, and we have hardly any information on it (in relation to Club Penguin) anyway. Out of curiosity though, how do you know it will be a mascot? Did you find an official confirmation on this?