Many users of Soulcalibur Wiki have their own original characters.
Sometimes it's not limited to just a creation of page with a brief description, but are write entire stories.

And I had a question:
Let's imagine, that Namco Bandai developers decided to add one of these original characters to the game.
Will the original character still be considered as a fanon or will become a canon?
Yes, if the character is simply added to a "quick match/mission mode" with random fighters, it will not to do a canonical (or not?).
But, if developers let the character take a small, but a plot role?
In this case the character will automatically become a canonical.
Will it remain "UserName:FanChar" or will acquire its official page?
And then can the creator/author of this character be able to make a changes to this page at his will - change the image, data and story of the character?
Or will the author lose his rights, and the original character has to pass to the developer?