I don't rewatch animes. But I did watch some people react to Youjo Senki, die inside to Clannad and philosophize over Death Parade.
Haikyuu multiple times >< Kuroshitsuji, Gekkan Shoujo Nozaki-Kun, Barakamon, Koe no Katachi (movies count right?) and Free; all I've watched at least twice or thrice skskskks oh and Fairy Tail and Bleach cus I liked to watch them for childhood's sake, esp since they often got telecasted on animax
I've lost count on how many times I've rewatched Hunter x Hunter, Monster and Haikyuu! Sometimes I also like to rewatch my favorite episodes of Cowboy Bebop, Mushishi and Samurai Champloo Finally, just recently I rewatched Violet Evergarden (I cried again!) and Steins.Gate Now that summer is approaching, maybe I should also rewatch Barakamon (I love that show)
The only anime I've ever rewatched was One Piece. I think I rewatched it twice or thrice. I'd start before each new big story arc, so I've seen each subsequent arc one time less than the previous one. In any case, I haven't really watched anime in two or so years and more than 2-3 titles a year in the preceding 4-5 years (IIRC).
Death note, it is entertaining for both kids and adults, it has a mature realistic vibe to it, it's not to long or to short, and I love the soundtracks.
Full Metal Panic: Season 1 and Fumoffu. Because they are great. And probably Land of Waves ark of Naruto, because it's was constantly on repetition instead of new series for like half of the year on TV. And there is not a single other anime that I seen multiple times. Well, as a whole at least. Oh, no, there is also Souten Kouro, I rewatched it 2 times.
Hunter x Hunter 4 times. It took me a month the first time, and every time after that less and less. Why? 18 hours a day. watching it. so good.
Bleach (only the 1st and 2nd arcs ) Gintama Twelve Kingdoms Hoozuki no Reitetsu Samurai Champloo Pokemon the Original Series
Shaman King Gundam Seed because the only way i could watch anime back then was pirated dvds, and we were only allowed to pick from a small selection
Asobi Asobase Gekkan Shoujo Nozaki-kun Daily Lives of High School Boys Chio's School Road Wotakoi: Love is Hard for an Otaku Kaguya-sama: Love is War
Hakuouki Attack on titan... Everytime there's a new season i rewatch it with my best friend since she forget what happened in the previous season. We watched in Japanese first then it got dubbed in our main language and its available on Netflix so..... We rewatched it.