User blog comment:Saruhikofushimis/Image & Content Permissions/@comment-27002267-20190412043250

Thank you for pointing this out, I agree that this issue is one that should not be taken lightly. I have gone through some of the translations/image works on the wiki and will list my findings here. Outstanding issues are in bold and italicized.
 * onkeikun - specializes in translations of Drama CDs [Individual has expressed consent on blog that usage is permitted with the condition of giving credit, which we have done]
 * grimmfeather - specializes in translations of theme song lyrics [Individual has expressed consent on blog that usage is permitted with the condition of giving credit, which we have done]
 * Comet Cloud- specialized in translations of theme song lyrics, specifically Rage On [Individual is uncontactable but translation has been in use for few years without issue, hence consent is assumed]
 * nagisaperopero - specializes in translations of Drama CDs [Individual has not been active since Feb. 2016, but seeing as he/she gave consent to other users to share/post translations, consent is assumed]
 * The Magazine Advertisements on the Free! Page is unsourced. (I transferred them from the Magazine Scans page, unknown who added them)
 * This is the same for the Magazine Scans on Haruka Nanase/Image Gallery, Makoto Tachibana/Image Gallery, Rin Matsuoka/Image Gallery, Rei Ryugazaki/Image Gallery and Nagisa Hazuki/Image Gallery
 * User:P.H. CP has been creating and adding videos as well as lyric translations to the movie and theme songs pages. As the user is the one adding them, I assume consent has been given.

-References-

This is what I have so far.