Here is a list of the top 10 best Dark Horse Hardcover Manga for Young Adults:
"Emma" by Kaoru Mori: This manga is a historical romance set in Victorian England and follows a young maid who falls in love with her employer.
"One Piece" by Eiichiro Oda: This manga is an action-adventure series that follows a young pirate and his crew as they search for the ultimate treasure known as One Piece.
"Naruto" by Masashi Kishimoto: This manga is a coming-of-age story that follows a young ninja as he fights to become the strongest ninja in his village and gain recognition from his peers.
"Fruits Basket" by Natsuki Takaya: This manga is a romantic comedy that follows a girl who moves in with a family that turns into animals when hugged by the opposite sex.
"Death Note" by Tsugumi Ohba and Takeshi Obata: This manga is a psychological thriller that follows a high school student who discovers a mysterious notebook that can kill anyone whose name is written in it.
"Cardcaptor Sakura" by Clamp: This manga is a magical girl series that follows a young girl who discovers a set of magical cards and must use her powers to capture them all.
"Nana" by Ai Yazawa: This manga is a coming-of-age story that follows two young women who share the same name as they navigate the challenges of adulthood.
"Fullmetal Alchemist" by Hiromu Arakawa: This manga is a fantasy series that follows two brothers who use alchemy to search for a way to restore their bodies after a failed alchemical experiment.