Transformers. I own every comic from the 80's. My first TF toy was Sunstreak. Sunday mornings were better than Saturday mornings because of TF. When the cartoon went to a five days a week format, I thought it was the best thing ever. Even now I have several TF tee shirts I wear.
Transformers made me what I am today. It started me reading, collecting comics, building my vocabulary, understanding the paceing of a story, acting (I would role play the stories), meeting new friends through our mutual love of all things TF and writing. The first time I used a news group was alt.Transformers. To this day I follow Transformers news where ever it may be.