Hmmm honestly I think I’m going to go with QT from Space Dandy even though he’s not an “animal”???? He’s nonhuman, it counts, and I don’t watch too much anime with animal sidekicks! He’s just so super adorable and always makes me happy!
Oh...oh lord. Here we go. D.N.Angel, Princess Tutu, Wolf’s Rain, Pokemon, Yu-gi-oh!, Fullmetal Panic! FUMOFFU, Pretear, Gravitation (ew), Loveless, Ouran Highschool Host Club, Fullmetal Alchemist, Nabari no Ou, Deadman Wonderland, Kuroshitsuji (all seasons), Noragami, Kuroko no Basuke, Yowamushi Pedal, Shingeki no Kyojin, Elfen Lied, Code Geass, Space Dandy, Kill la Kill, Tiger & Bunny, Death Note, Witch Academia, Free!, Magi, Donten ni Warau, K Project, No.6, Psycho Pass, Death Parade
Cough cough...cough cough...erm...Shingeki no Kyojin. Idk it had a strong start, but the art/story couldn’t keep my interest at all. Not to mention the mangaka is really creepy and militaristic, so it turned me off of the series, as did the horrific fanbase. Honestly it just comes out so slow and doesn’t /go/ anywhere, and I got bored within the first month I was into it, which is a bad sign.