• Hunter x Hunter (2011)
• HUGtto! PreCure
• Revolutionary Girl Utena
• Kaichou wa Maid-Sama!
• Hyouka
• Sword Art Online (S1-4) (I define "season" by "change in opening")
• Fantastic Children
• FLCL (:Progressive, :Alternative)
• Mob Psycho 100
• Gear Fighter Dendoh
• Mashin Eiyuuden Wataru
• Chou Mashin Eiyuuden Wataru
• Mashin Eiyuuden Wataru 2
• Flip Flappers
• Sarazanmai
• Lu Over the Wall
• Okko's Inn
• Green Legend Ran
• Spirited Away
• Castle in the Sky
• Tales from Earthsea
• Howl's Moving Castle
• Ponyo
• Whisper of the Heart
• Ocean Waves
• The Cat Returns
• The Secret World of Arrietty
• Akira
• Noiseman Sound Insect
• Hoshiai no Sora
• Panty and Stocking with Garterbelt
• Mobile Suit Gundam 0080: War in the Pocket
• Ride Your Wave
• In This Corner of the World
• Eizouken Ni Wa Te Wo Dasu Na!
• Digimon Adventure
• Digimon Adventure 02
• Digimon Tamers
• Princess Arete
• Sonny Boy

Skipped some episodes but I consider them finished;

OR, anime that I would just watch when I was younger, whenever they were on TV.

So, unlikely to be picked up and finished.

• Pokémon XY(&Z)
• Pokémon BW
• Pokémon DP
• Fairy Tail
• GeGeGe no Kitaro (2007)
• Sgt. Keroro
• K-ON