Often, a cliche childhood friend onee-san manga has repetitive tropes like the childhood promise that always comes true or the overused protective older sister stereotype. Also, the story might lack depth in character motivations and have very straightforward story arcs.
Well, 'eroge tensei onee novel' might be a piece of literature that combines elements of eroge, which often have adult or sexual themes in Japan, but if we assume it's not that kind of content. It could be about a story where a character experiences a reincarnation in a world that has some unique features and an important older sister - like figure in the plot. Maybe it's about the character's journey and how this 'onee' character influences it.
Definitely! One Piece manga has a unique plot, diverse characters, and it keeps you engaged with its constant surprises and adventures. The art style is also distinctive and evolves over time.
The One Piece manga is not in color. It's presented in black and white, which allows for greater focus on the linework and details of the illustrations. Colorized versions might exist in some limited cases, but the majority of the manga is black and white.