I started pretty much the same as Daikomonohashi. I was watching Godzilla and other Toho movies literally since birth (I honestly cannot remember my first Godzilla movie). As I got older, I watched Gamera and other kaiju stuff, but it really wasn't until late high school and college that the Internet community broadened my horizons and got me to watch other varied stuff.
I started watching Ultraman when The Next came out, starting with Tiga and the original series, and shortly after that, Daikomonohashi introduced me to Kamen Rider Blade and Kamen Rider W, stuff which I previously wouldn't have watched on my own accord. Now it's snowballing and I'm pretty much open to anything.