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You make a separate page.
But
The character has to have a very distinctive mode of speech. (As discussed here before, although not recently.) The character should also have a reasonably varied vocabulary. (That one came about after pages were made for Pokémon.)
Don't touch the main pages.
Others can chime in with what I missed.
Coming back to where you started is not the same as never leaving. -Terry PratchettWe have a thread dedicated to cleaning up Self-Demonstrating Articles, so it might be helpful to ask more specific questions on the thread.
I don't think you have to, but they might be able to help you draft an article (I'm not sure, though).
We also have an index of characters with this type of article.
But yeah, I think you can write your draft in Sandbox.Arial (your troper page sandbox) and then move the article to the Self-Demonstrating/ namespace (with a similar naming pattern to SelfDemonstrating.Freeza or SelfDemonstrating.Spock).
Look at all that shiny stuff ain't they pretty

I know what Self-Demonstrating articles are, both as a trope and a page. As a trope, it's used in an article to parody said article. As and article, it's a thing describing itself(Such as the Wheatly and G La DOS pages). It also appears that the Self-Demonstrating articles are the mains for those characters. So, how does one make a Self-Demonstrating article for a character? Do you modify the main and it gets nominated Self-Demonstrating, or do you make a separate page altogether?