Older Millennial.
Naussica of the Valley of the Wind. It was my first ever encounter with science fiction. I was maybe 4 or 5 years old. I was enraptured
Babylon 5. I grew up with Star Trek, and Star Wars, and they were ok. B5's long overarching plot and character development blew me away. G'Kar was always my favorite.
The Wheel of Time. I found the books in the midst of a lot of teenage turmoil and mental health crisis in the late 90's. I took several key traits among my favorite characters and internalized them. Rand's refusal to hurt women, Perrin's methodical approach and integrity, Egwene's grit and work ethic, etc. It helped me consciously and intentionally form the rough basis for my values.