Yes, there are. Some original anime series are created without being based on a manga. For example, 'Neon Genesis Evangelion' was an original anime concept.
Not always. Many animes take some creative liberties to make the story more engaging for the animation format.
Yes, there are. Some anime are original creations and not based on manga. For example, 'Neon Genesis Evangelion' was an anime that didn't have a manga counterpart when it first aired.
There are a few anime like 'Kiznaiver' that don't have a manga. It might be because the story was conceived directly for the anime format to offer a unique viewing experience.
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.
Yes, it does. The anime Free is based on a manga.
Yes, it does. The anime is often based on a manga source.
It's hard to say. Sometimes daemons from certain franchises have manga adaptations, but it varies. You could try doing a search on popular manga platforms or asking in relevant forums for a definite answer.
Not that I know of. I haven't come across a manga specifically related to free swimming.
Yes, it does. The Redline anime is based on a manga of the same name.
Sure does! The anime Bem is based on a manga that provides the original source material for the animated adaptation. The manga often offers more depth and details to the story.