Well, that's a tough one. 'Gamera' has a pretty decent anime adaptation. It manages to capture the monster's power and the story's excitement. But opinions vary as different people look for different things in an adaptation.
The manga and anime are closely related. The anime usually tries to stick to the main plot and characters from the manga.
The anime ending of Kaiju No. 8 might not align exactly with the manga. It could be that the anime stopped earlier or covered a slightly different part of the story.
The Kaiju No. 8 anime ending in the manga is a bit tricky to pin down. It could align with a significant event or cliffhanger in the manga, but there's no fixed rule. Usually, it's a balance between giving a satisfying conclusion and leaving room for more if the series gets renewed.
Manga kaiju and their anime adaptations often vary in terms of pacing, focus on certain characters, and the level of detail in the background settings. Some changes are made to appeal to a wider audience or to make the story more engaging for the animated format.
For me, Naruto's anime adaptation is top-notch. It manages to capture the intensity and emotion of the manga perfectly. There are a few fillers, but they don't ruin the overall experience.
For many, 'Death Note' has a top-notch anime adaptation. It stays true to the core concepts of the manga while adding its own visual flair and narrative enhancements.
I'd say 'Fullmetal Alchemist: Brotherhood' has the best anime adaptation. It sticks closely to the manga, has amazing visuals, and the voice acting is superb. It's a near-perfect translation from page to screen.
For me, 'Naruto' has one of the best anime adaptations. It keeps the key plot points and character developments from the manga intact while adding some nice visual enhancements and filler arcs that enhance the overall story.
One could argue that 'Fullmetal Alchemist' has an excellent manga adaptation. The anime closely follows the manga's plot and character development.