I started reading them around Book 3 or 4 I think, back in 1997 or 1998, whichever year they started in, and me and my best friend Ryan were the only two that really read them, that I knew, but we were always discussing the books after, and playing 'Animorphs' when we got together to play, lol. He stopped reading before I did though, cause he got tired of how every book was basically the same, and it was around that point I started reading each new book in under a day.
Oh, and I also remember I dropped the first Tobias book, book 3, in the bath water when I was reading it in the bath once, and Book 4, the Cassie dolphin one, the front cover ripped the space between the top of the dolphin head and the top of the book cover.
And there was this cheapo Pac-Man kind of Animorphs game I played - I think it was free to download, but it may have came from a cereal box I can't quite remember. And anyway, it was a Pac-Man kind of screen, but with various obstacles, and you had to go around collecting things, while trying to avoid Chapman and other controllers, and once you had a certain amount of power ups, you could morph to a tiger for a limited time and chase them. Something like that.
Oh, and when my sister was in college, which was around that same time that Animorphs was big and I was huge into it, the guy that played Tobias on the TV show, she dated his best friend.