Well, one major difference could be the way the relationships are portrayed. In oni gf manga, the dynamics between characters might be more complex and unpredictable. Also, the themes explored could be quite different from common manga in the same genre.
The main differences in the 'oni chichi manga' and its adaptations lie in the visual presentation and sometimes the pacing. The art style might vary a bit, and certain scenes could be shortened or expanded for better flow in the adaptation. But the core story and characters remain largely the same.
Well, it's possible that the 'oni ga deru' raw manga and its adaptations vary in how they present the story. Maybe there are changes in the order of events or emphasis on certain aspects. However, more research is needed to determine the exact dissimilarities.
Oni Press has produced several excellent comics. 'Invader Zim' is popular for its quirky humor and distinctive visuals. 'Letter 44' is another top pick with its sci-fi mystery and engaging plot.