Ano Hana is the one piece of fiction that could ever make me cry & Gurren Lagann helped curved me out of depression because it's that damn ridiculous, masterful and inspiring.
Naruto is far from best but holds a special place in my heart.
Wrong section. I have watched many so I cannot chose specific.
But some of my favorites will be:
Kamisama hajimimaste
Erased. (Didn't like the ending)
Romeo's blue sky.
Naruto. (I liked part one more)
Seraph of the end.
Ajin.
I can't name a best one, but I like my classics such as Yu Yu Hakusho, ruroni Kenshin, I also like Naruto, HxH bleach was pretty good, Gundam Wing just for the memories though now I can't sit through it anymore lol and of course One Peice
Can't name just one. The ones that affected me the most were:
Neon Genesis Evangelion;
Ghost in the Shell;
Code Geass;
Ergo Proxy;
Serial Experiments Lain.
I'd also add Naruto to the list, but purely because I've been following it for over 12 years and now I have strong nostalgic feelings for it. I wouldn't recommend it to anyone nowadays tbh.