Filler, some people don't like it because it's not canon but the good ones(yes there are good ones) really allow the storyline to be filled in where it was beforehand unknown.
They Should Make Filler About:
-Kaguya Clan(Kimimaro's Clan)
-Yuki Clan(Haku's Clan)
-Jugo's Clan
-Hozuki Clan(Mangetsu, Suigetsu, & 2nd Mitzukage's Clan)
-7 Swordsmen of the Mist
-Senju Clan(Clearly there had to be OP Ninja other than Hashirama, Tobirama, & Their Father)
-Hyuga Clan(Neji, Hinata, Hiashi, Hizashi, etc.)
-Sarutobi Clan(Clearly Good Genes)
-Uzumaki Clan(Preferably the Uzumaki Elder & Mito Uzumaki)
-Uchiha Clan(Preferably Including: Kagami Uchiha, Shisui Uchiha, Fugaku Uchiha, Izuna Uchiha, Elder Son)
-Sound 5(Would love to see them against other strong opponents, they were great well made characters imo)
-Kinkaku Force(That killed Tobirama)
-1st Gen Kage
-2nd Gen Kage
-3rd Gen Kage
-Orochimaru's Experiments
-Sasuke's Training With Orochimaru
-More about Asuma Sarutobi
-Hiruzen Besting Danzo
-Itachi's Journey
-Jiraya's Journey
-Zabuza's Journey
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They Should Make Filler About:
-Kaguya Clan(Kimimaro's Clan)
-Yuki Clan(Haku's Clan)
-Jugo's Clan
-Hozuki Clan(Mangetsu, Suigetsu, & 2nd Mitzukage's Clan)
-7 Swordsmen of the Mist
-Senju Clan(Clearly there had to be OP Ninja other than Hashirama, Tobirama, & Their Father)
-Hyuga Clan(Neji, Hinata, Hiashi, Hizashi, etc.)
-Sarutobi Clan(Clearly Good Genes)
-Uzumaki Clan(Preferably the Uzumaki Elder & Mito Uzumaki)
-Uchiha Clan(Preferably Including: Kagami Uchiha, Shisui Uchiha, Fugaku Uchiha, Izuna Uchiha, Elder Son)
-Sound 5(Would love to see them against other strong opponents, they were great well made characters imo)
-Kinkaku Force(That killed Tobirama)
-1st Gen Kage
-2nd Gen Kage
-3rd Gen Kage
-Orochimaru's Experiments
-Sasuke's Training With Orochimaru
-More about Asuma Sarutobi
-Hiruzen Besting Danzo
-Itachi's Journey
-Jiraya's Journey
-Zabuza's Journey
-
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