>>275857Neon genesis evangelion
FLCL
Haruhi
(And if you dont mind stuff from the 2010s then)
Tatami Galaxy
Space dandy
Hunter x hunter
Samurai champloo
Gurren Lagann
K-on! (If you're into SOL)
And hellsing ultimate
All those are series i never wanna see a single extra episode from since it'll kinda may ruin the magic.