Some of mine are:

Durarara - this site of course!

Planetes & Twin Spica - Taught me about Space Junk! While I wish Twin Spica was longer, I still really enjoyed the ride.

Hikaru no Go & Piano no Mori - inspired me to be more persistent towards my goals and to appreciate how far I've come when it comes to my interests (as well as work to get even better)

Kemono no Souja Erin - impacted my career choice (in a way that's not immediately obvious)

Nodame Cantabile - got me into classical music

Haikyuu - got me to exercise lol

Looking forward to reading your guys' replies!

Slam Dunk and kuroko=im a neet so i surprised it made me go outside and awkwardly play basketball outside with strangers....motivation only lasted a day. never go outside ever after that hahahaa....

oregairu- not impacted, more like i relate to hikagaya...i also want something genuine

code geass= made me like bad endings where mc dies.....made me like stuff like akame ga kill ending.

Inuyasha me hizo cantar
Sakura card captor me hizo dibujar
El detective conan me hizo amar la resolucion de acertijos
Death note la profundizo
Senyuu me hizo reir en mi peor momento
Magi me dio imaginacion
Soul eater me hizo amar el rock
kimi ni todoke me hizo entender mis sentimientos romanticos
Y durarara me dio este chat en mi juventud para tener amistades de juego, pero fue entretenido en su epoca uwu