I started 읽기 anime/manga at 2007, the first 망가 I read was Inuyasha, but the first 아니메 I ever watched was Sailor Moon (I like to add infromation sometimes :3)
Yotsuba@!. I think it could still possibly be my all-time fave manga. Very simple in terms of storyline, but very sweet and funny, and the artwork is beautiful.