It’s very very small here unfortunately. I grew up with manga (and anime but never liked it) and I’ve read a ton. For shoujo, anything from Tamura Yumi sensei is pure gold in terms of storyline and characterization. Basara will always be the most epic story ever created regardless of medium for me. A masterpiece by a true genius. I’m mostly inspired by Tamura sensei In everything I do.
For shonen, Takehiko Inoue’s Vagabond, Ikegami Ryuichi’s Santuary (and most others), Yoshihiro Togashi’s Hunter x Hunter. There are a lot more if you like these brutal mangas.
And while I don’t like animes and prefer the manga version, the greatest anime of all time (if not the best Space Opera of all time) would be The Legend of Galactic heroes. Anime so complicated and adult it requires an LOGH 101 class, a note, a chart, a dictionary, and your hand on the rewind button because you went to get a drink for a second and … whoaaa what did I miss? Every word that comes out of the characters’ mouth are important and you’ll be tested 50 episodes down the line if you had been listening lol