Is anime always based on existing comics?

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.

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.

No. 'Lost in Space 2018' is a reboot based on the original 1960s series. It has its own original storyline created by the show's writers and producers, not based on fan fiction.