Ah yes, Animorphs... Besides a Power Ranger, that must've been what I daydreamt of being before Pokémon came along. Too bad our library only had like 7 books out of the series. I learnt most of the storyline from Wikipedia, lol.

As for Goosebumps, I was kicked on the Cheerleader books. I still remember one of them getting killed by steam-hot shower water. They mentioned how she looked "as red as a lobster". Now there's a mental image I never forgot...

I read some Choose Your Own Adventure stories too, when I was little.
It helps to have a known writer live +/- 5 houses away, too. I think I read through his whole section or something (like 10 books or something).