User blog comment:P進大好きbot/Images without Copyright/@comment-3427444-20200131171829/@comment-24061664-20200201170652

By just glancing through wikipedia, there seems to be 4 factors fairuse in US copyright law, and in the first factor is "the purpose and character of the use, including whether such use is of a commercial nature or is for nonprofit educational purposes." and "Likewise, the noncommercial purpose of a use makes it more likely to be found a fair use, but it does not make it a fair use automatically." For thinking of the "3. Amount and substantiality", minimum use of character as avatar for nonprofit purpose is likely to be considered as fairuse.