>>283536131
>Late '80s
Hokuto no Ken, St. Seiya, & Dragon Ball (+ Gundam if we count mecha, + JoJo if we count manga)
Most defined by HnK until DB got big enough
>Early '90s
DBZ, Ranma, & Yu Yu Hakusho (+ Sailor Moon if we count pure shojo, + Slam Dunk if we count sports manga, + JoJo if see above)
Most defined by DBZ and obviously so
>Late '90s
Rurouni Kenshin & Maybe Trigun (+ Evangelion if we count mecha, + Conan/Pokémon/Yugioh if we count kids series, + InuYasha & One Piece if we count manga)
Most defined by Kenshin, unless we count Evangelion and Pokémon (GT need not apply)
>Early '00s
InuYasha, One Piece, Maybe HxH, & Naruto (+ FMA if we count war epics, + Conan/Pokémon/Yugioh if we count see above)
Most defined by InuYasha, mainly because it peaked here while the latter ones kept going (even though One Piece & Naruto had their first peaks here too)
>Late '00s
One Piece, Naruto, Bleach, & Maybe Soul Eater (+ Death Note if we count crime thrillers, + Code Geass & TTGL if we count mecha, + HxH if we count manga, + Pokémon if we count see above)
Most defined by One Piece having its 2nd peak with Water 7 (and 3rd with Marineford) while Naruto was on the back burner
>Early '10s
One Piece, HxH again, Naruto, Bleach, & Maybe Fairy Tail (+ FMA again & Shingeki no Kyojin if we count war epics, ahead of all but Naruto)
Most defined by Naruto going through Sasuke vs Itachi, Pain's Assault, the Five Kage Summit, and the Great War
>Late '10s
One Piece, Naruto, & MHA (+ 1PM if we count battle seinen, + Shingeki no Kyojin if we count see above, + HxH if we count deadbeat manga, + JoJo again if we count retro)
Most defined by MHA for being the new kid on the block while One Piece was in the gutter and Naruto was ending, unless we count SnK (Sooper need not apply)
>Early '20s
One Piece, Bleach, MHA, Demon Slayer, & Jujutsu Kaisen (+ SnK if we count see above)
Most defined by Demon Slayer and obviously so, even though Late SnK was arguably bigger at the time