Hi, those type of images can be uploaded to a Wiki (clarifying that is fanmade and putting a proper licensing template)? Or is against some policies? I didn't found policies about that, so I'm asking here.
Yeah. Be aware that a large percentage of the DCMA takedown requests Fandom receives (ands acts upon) is about fan art that's taken from sites like DeviantArt without permission, credit or both. Fan art does not really count as fair use.