Yeah I have a few anime that have changed me for the better as silly as it may sound.

The most prominent change for me though would have to have originated from K-On!. My guitar used to rot in a corner collecting dust, and I had lost all my motivation to play it and learn for around a year until I began watching K-On!. Now even though the series has ended, since then, I've bought a new guitar and have been enjoying playing/learning on it every single day. I think I owe K-On! for re-igniting my passion for playing.

Also, Toradora! made me realize how much of a lazy shit I am when it comes to cooking, cleaning, etc. so now I try to make an effort. xD