What was your first anime? When did you started to watch it? How did you become aware of its existence?
Was it the anime that made you an anime fan? (If you consider yourself as such)
How does it rank for you? Would you say you still like it? Would you consider it one of you favourite anime series?
It’s been pretty long ago for either interpretation, so my memory might be off.
The first ever was probably Heidi or Biene Maia.
The first ever not explicitly produced for a western audience was probably Captain Tsubasa.
The first after having a concept of anime vs. cartoons was one of Akira, Ghost in the Shell or Blue Lagoon.