Tosaka

is an ornithologist who works in the services of Konohagakure.

Personality
Tosaka is a very eccentric man, who shows great passion and effort in his work, even climbing up a tree return a nest with its young. He feels the best way to understand something is to apply all five senses to it, even licking the most crude of things.

Appearance
Tosaka is a fairly tall man of light complexion and pale-green eyes. He has silver hair that is chin-length with short bangs over his eyes. He wears a beige bodysuit with a long orange shirt over it and brown gloves along with brown sandals.

Abilities
While apparently not a shinobi, he was requested to join a ninja team on an investigative mission due to his extensive bird knowledge.

Jūgo Arc
When word reached Konohagakure about birds randomly attacking a village, Tosaka was requested to work alongside Team 7 and Team 15. Along the way, Tosaka would continuously analyse any evidence of birds in the area, at times grossing out some of his allies. Upon arriving, the group was attacked by strange-looking birds. At the village, they learned that many people attacked by the mutated birds quickly became sick and were covered in Cursed Seals. The villagers also found an unconscious Jūgo, who was recognised by Sarada and Mitsuki. When the man awoke and was questioned, one the sick villagers went on a feral rampage and attacked Tosaka until he was suddenly drawn to Jūgo.

Later, after the shinobi team managed to subdue Jūgo from his blood-lust, it was learned that Jūgo was working to cure birds of their Cursed Seals, absorbing the inflictions into himself. After performing a blood test, Tosaka concluded from a blood test that the outbreak and Jūgo were not related. With Konohamaru too weak to join the field after being drained of chakra by the rampaging Jūgo, he instructed Team 15 to report to the village while Team 7 observe Jūgo from afar. Tosaka joined Team 7 and watched Jūgo continue to cure birds. While Tosaka admired how much Jūgo cared about the birds, it was noticed how the efforts were harming him and even making him a times transform. Jūgo insisting it was too dangerous to work with them, as his rampages were becoming more frequent. The genin however were determined to join him regardless. Their investigation eventually led them to the River Country, where the authorities were also investigating thing. Soon enough, Jūgo did rampage, but was stopped by Boruto by using one of Jūgo's injections. Stating firmly that they wanted to save the birds as much as him, Jūgo trusted the team with his remaining injections.