Oh man, I totally remember flipping to channel 3 to watch VHS tapes! I also had a device that was specifically for rewinding tapes, haha. I wonder how many people had those.
You've probably already talked about Pokemon, but as far as video games go Pokemon Ruby and Sapphire are by far the most nostalgic things for me. I also still have my e-reader, the accessory for the GBA that you could slide cards in to unlock games and stuff. A lot of Pokemon cards were scan-able, and I think there were also Animal Crossing cards and a bunch of other random stuff. It's not super exciting in hindsight, but I had fun with it.
Speaking of Pokemon cards, I loved collecting those and Yugioh cards. And I always watched both the shows after school.
Oh, I also had a sizable collection of Beanie Babies, in true 90's kid fashion.
Pow! Right in the Nostalgia is a super fun comic, I hope you get lots of great ideas!