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I would imagine that fanart used on Character pages has to be credited to the original artist(s), just as it is policy on the site as a whole.
If a piece of media doesn't have official pictures of the characters in it (namely transparent vectors), then it's better to leave the character entries without images, at least IMO.
Wuewuewuewuewueing my way to the bank.

I'm curious what the protocol is for images on character pages, specifically when there is no existing canon art of the characters. (This is probably most relevant for works that fall under the literature category.)
Sometimes, I see people use fan art, since there is no official character art. Is this acceptable, or is it preferable to just exclude images altogether in this case?