Does the OPM manga follow the webcomic closely?

Nana follows the manga quite closely. The story arcs and character traits are maintained, although there could be some slight differences in the presentation to suit the medium of animation or for creative purposes.

Not really. There are quite a few differences between Excarina and the manga.

It follows to a considerable extent. But there are still some differences, especially in the details and pacing.

It follows quite closely. The anime of No.6 mostly adheres to the manga plot, with just a few minor differences that don't significantly change the main story.

Definitely. Brotherhood is highly regarded for its faithfulness to the manga. It captures the essence, themes, and progression of the manga accurately. Minor differences exist, but they don't significantly impact the overall experience.

It depends. Some parts are quite similar, but there are also noticeable differences.

Yes, it does. The adaptation of Alita sticks pretty closely to the manga, maintaining the key plot points and character developments.

Yes, it does. Baki the anime mostly adheres to the manga without major deviations.

Not really. Gantz 0 has some significant differences from the manga that might disappoint die-hard fans.

Baki 2018 mostly adheres to the manga. Though there are a few tweaks here and there, they don't deviate from the essence and key elements of the original manga.