all-time and ultimate favorites and irreplaceable:

• ansatsu kyoushitsu
• dr. stone
• fruits basket
• haikyuu
• kaguya sama
• neon genesis evangelion
• ouran koukou host club
• vinland saga
• violet evergarden

too goated to not be included, yet have some aspects that made me refuse to add it into my ultimate favorites:

• asobi asobase
• erased
• flcl
• fullmetal alchemist brotherhood
• great pretender
• hunter x hunter
• link click
• serial experiments lain
• shingeki no kyojin