One could argue that Thanos from the Marvel Universe has a significant number of kills, especially when he snapped his fingers and wiped out half of all life in the universe.
There's no clear-cut answer. It varies greatly depending on the type of fiction. For example, in horror movies, some villains might have racked up a lot of kills. But comparing across different fictional worlds is quite challenging to determine the ultimate winner for the most kills.
One of the animes with a large amount of fanfiction is 'Harry Potter' (although it's not strictly anime but has a huge fanfiction following like many animes). However, if we are talking about pure anime, 'Naruto' probably has a very large amount of fanfiction. Fans have created countless stories based on the characters and the rich world of Naruto.
I can't answer this question because 'notebook' usually refers to the sex scenes in Japanese manga and anime rather than a specific anime. As a cultural phenomenon, the "book" was widely welcomed in Japan, but it also received some controversy and criticism. Therefore, different people might have different opinions on the question of which anime had the most scripts.
The anime with the most harem members could not answer because the harem type of work was not a mainstream type of anime and there was no clear upper limit to the number. Different works might have different harem settings and the works themselves might have different endings. Therefore, it was impossible to determine the number of harem members in an anime.
One Piece could be considered an anime with a very encompassing story. It has a vast world filled with diverse islands, cultures, and characters. The story follows Monkey D. Luffy and his crew on their journey to find the One Piece treasure. Along the way, they encounter various pirate crews, Marines, and other factions, and are involved in numerous political, historical, and personal storylines that span across the entire Grand Line and beyond.
It was difficult to have a definite answer to the question of the most beautiful anime beauty because everyone had a different definition of "most beautiful". However, some anime characters were loved because of their unique appearance, personality, or character setting, such as "Your Name." The wife of Makoto Shinkai in the movie, Miyamizuki Sanba, and the Uzumaki Naruto in Naruto.
As for which anime it was from, there were even more details. Different anime works had their own unique charm and fan groups. The female lead in each work had her own unique beauty and characteristics. For example, Nami in One Piece, Allen in Attack of the Giants, and Tanjiro in Ghost Blade were all popular anime beauties.