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Available free comic ebooks (Kindle edition) at time of post appear to be from Dark Horse
Avatar: The Last Airbender
https://www.amazon.com/dp/B07KJZ1T3H
Avatar: The Last Airbender and The Legend of Korra!
https://www.amazon.com/dp/B09V3BZLTP
Hellboy
https://www.amazon.com/dp/B0CX1YDWBN
Young Jedi Adventures
https://www.amazon.com/dp/B0CX12ZN9X
Dark Horse fan-favorites Set (12 book series)
https://www.amazon.com/gp/aw/d/B07JGQBCNK