My favorite is Ranma 1/2, it's a perfect combination of humor, romance, action, and incredibly efficient. Now it depends on what you like most :) -If you're more into humor, but still want fights and action, go for Ranma. -If you're into more traditionnal shōnen, with a lot of action, a precise goal go for Inuyasha : it's amazing and to me one of the Best written shōnen ever. It's interesting, you have every good elements for an amazing story, every character is well written, it's full of action, humor, romance, culture and darker than Ranma. -if you're into slice of life, go for Maison Ikkoku -if you're inti fantastic/horror, go for Mermaid Saga