Board Thread:Support Requests - Getting Started/@comment-35245144-20180407221228/@comment-9605025-20180407231433

Based on Wikia's general license, I would guess it is fine as long as you provide credit to the source of the image and do not prevent others from copying the image from your thesis/article. That may, however, be problematic as many publishing companies like to retain full control over distribution and reuse of content they publish.