[Headcanon] How Kumo really ended up with the Nibi.
Alternatively: That one time Tobirama made friends with the Necromancer Hellcat.
Because I can totally see the Nibi trolling the Shinobi world. Mito thinks it’s hilarious, and Tobirama has got to get his kicks somehow.
It begins when Mito seals the Kyubi into her navel with nothing but ink and chakra. Suddenly the whole shinobi world is gearing up, ready for battle. In the idiot-mind of Tobirama’s older brother (seriously, this naïve trusting nature of his will get him killed someday) the best thing to do is to track down the other bijuu, seal them up into nice little packages, and ship them off to neighboring countries.
‘Everybody gets a Bijuu!’ He announces over the kotatsu during dinner one night, beaming at his own brilliance.
Tobirama facepalms when he hears this.
Mito snorts, but secretly she agrees with her brother-in-law.
This can only end in tears.