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My personal opinion,

1) Mangas, Illustrations always come with artist names and/or circle names.

2) Anime pics are more like line products not personal arts. copyrights is usually enough. artist/studio names are secondary.

3) Game pics are differ from studios. mostly, they are credited by the main line drawer. sometimes studio hidden their name. in the latter case, I'd suggest to add studio names instead of artist names.

4) In any case, character names are subtle.