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I'm surprised to hear Devilman Crybaby and Trigun Stampede didn't adapt their respective manga

Devilman (from the 70s) and Devilman Crybaby feature original stories that have little to do with the manga.

With the exception of Arc (which is a faithful adaptation), every Getter Robo anime is its own plot that has only the premise in common with the manga (except Change, that one doesn't even have that).

Ghost in the Shell never got an adaptation, every anime is totally different from the manga.