Mostly no. Anime can have diverse sources of inspiration. Some are based on comics, but others might come from light novels, or be the brainchild of the animation studio itself. It's quite a mixed bag.
Not always. Sometimes fan fiction can take inspiration from a concept or genre rather than a specific existing work.
It's not straightforward. Generally, creating comics with existing characters without the rights holder's consent is against the law. However, there are exceptions, like when it falls under fair use or you obtain a license.
Not really. Most anime are fictional creations with imaginative storylines and characters.
Not necessarily. Many animes are original creations that aren't adapted from manga. They can have their own unique storylines and concepts.
No, it doesn't. Sometimes animes are based on light novels, video games, or are completely original concepts. For example, 'Sword Art Online' was based on a light novel, not a manga.
Yes, Twilight was initially inspired by a dream that Stephenie Meyer had, which could be considered a form of inspiration from her own subconscious rather than a pre - existing story in the traditional sense. However, the idea of vampires and werewolves has a long - standing history in folklore and literature, so in that regard, it draws on pre - existing concepts.
My story is completely original. I came up with all the ideas and plotlines myself.
I'm not sure if there are any official anime based on what you described. Usually, mainstream anime avoid such themes.
Not necessarily. The quality of the ending depends on various factors like the writing, adaptation choices, and audience expectations.
Not always. Sometimes there can be differences, but it depends on the specific anime and manga.