I can't recall all that well which was my first, since I've been watching anime since I was really little to be honest, but I can list the first animes that I remember. There just won't be any particiular order hehe.
The original Yu-Gi-Oh was good.
Sailor Moon (The movies were probably my first animes, but I watch the actual anime now. Sailor Moon Crystal is just the remastered version)
Wolf's Rain(I cried)
Cowboy Bebop(Possibly the first)
Escaflone(GOD HOW IS IT SPELLED? ALSO I'm referring to the movie and not the actual anime for this, but both are awesome! Also possibly my first anime)
Ghost in the shell (Possibly my first)
Dragon Ball Z (OR any season of the Dragon Ball series tbh, who knows when I started watchin this)
Naruto (Haven't watched the new stuff, haven't watched any of it in years, but the show was great in the beginning)
These were all like my gateway animes
