Has there been an anime that exceeds the length of its corresponding manga?

Yes, it's possible. Sometimes anime producers decide to expand the story or create new arcs that weren't in the manga. Take 'Fullmetal Alchemist: Brotherhood' for instance, which followed the manga closely but also had some additional elements.

Occasionally, yes. It can happen when the anime producers decide to create additional content or expand on certain plotlines to make the series more engaging for the viewers.

In my opinion, Naruto's anime and manga have a significant resemblance. The core story arcs and character traits are well-preserved. However, there might be some filler episodes in the anime that don't exist in the manga.

I think One Piece does. The anime closely adheres to the manga's plot, with only minor changes for better presentation on screen.

Well, it varies depending on your perspective. Some might argue that 'One Piece' has notable differences between the anime and manga. However, it's a matter of personal perception and what aspects you focus on.

Yes, there have been cases. Sometimes, anime projects get greenlit based on a concept or early drafts before the manga is fully developed.

Yes, there have been. Some original anime are created without being based on any existing manga. For example, 'Neon Genesis Evangelion' was an original concept developed directly for the anime medium.

One such anime could be 'Original works' that are created specifically for the animation medium and have no prior manga source.

For me, 'Astro Boy' has a pretty close resemblance. The anime captures the key elements and themes from the manga, with only minor tweaks for better visual presentation and story flow.

They can be quite similar, but there are often some tweaks and additions in the anime to make it more visually appealing and engaging.