Glad to see I'm not the only one who would mention Digimon here. I like Tamers in particular, if you can call 10 years ago as being "old". It's one of those things where, despite being exposed to some of its darker aspects earlier in my childhood, I was only able to better understand them after growing older (for instance, I'm much more sensitive to death now). There's also being a bit more familiar with the inspirations (i.e. Lovecraft) behind the main villains, among other things, and knowing the background for all this makes me appreciate the Tamers universe more.
There are quite a few other series mentioned in this thread (too many to list) whose names I recall from my distant past, however I actually don't remember too many details about most of them. I was better at retaining memories of video games than TV shows back then.
