Samurai Champloo did not have a continuation in the manga. The story ended as it was originally presented without any further developments in the manga format.
In general, the endings of the Samurai Champloo manga and anime are not the same. The manga might have explored certain storylines or character developments differently to offer a unique conclusion.
No, it's not a true story. It's likely fictionalized or based on some historical elements but with creative liberties taken for entertainment purposes.
Sure, Blue Eye Samurai is a manga. It stands out for its creative world-building and the depth of its narrative. Many fans appreciate its combination of action and drama.