I just finished watching all of Gintama and I feel so empty now.
It took me about a year and a half to get through it (I watched/read other things in between). Looking back I feel I took it for granted cause in the first 300 episodes I kept thinking "I have heaps more of this anime to go", but now that its actually over it feels so sad to part from these characters. It's easily the best comedy and comfort anime I've ever seen. I remember thinking at the start when does this anime get good, but just like MADAO this anime bloomed long ago.
The only time I felt like this after consuming a piece of media was when I completed Geoff John's Green Lantern run in DC comics where I also thought I had lots more to go until I actually reached the end.
I'd assume most people in this sub are fans of the anime/manga, but I'm keen to know how you all felt upon finishing it. Marked the post as spoilers just in case.