Tsukiya Hatake

Tsuki adopted Inoichi as their dad. That also means Ino's their adopted sister. Kakashi def thinks it's hilarious they basically have three dads. (The third is Ibiki).

Tsukiya's known Inoichi practically her entire life. When she was a baby, Kakashi and Sakumo liked taking her to the Yamanaka flower shop. One of her first memories was Inoichi remembering that they loved hydrangeas so he gave them a bouquet of them, and she was about 2.5 years old at that time.

Tsukiya would regularly see him throughout their early years but around the time they become a chūnin, they get the opportunity to work with him. When they start at Intel, they train under Ibiki at first to get a good understanding of interrogation, but Ibiki knows Tsukiya would be better suited to analysis.

At the end of Letting Go, Inoichi starts their training in the analysis unit. He first starts them off by showing them Psycho Mind Transmission, and he eventually teaches them due to the necessity of their job. During his initial scan of them, he was the one who noticed the seal on Tsukiya's memories of Danzō. When he asks about this, Tsukiya tries to answer but can't because of the seal.

When Inoichi is killed in the 4th Shinobi War, Tsukiya mourns him with Ino. They regret not being able to be there for their team in Analysis, instead being too sick from using so much chakra on a previous mission. However, as their kekkei genkai's ghost-seeing ability started to develop, they started seeing his ghost which helped their grief, even just a little bit. In the end of Castle of Glass, he is revived and Tsukiya’s team with Ino and Chōji find him and rush him back to the village. In the epilogue, he starts writing things down in a diary for both Tsukiya and Ino in order to preserve their memories together, as a parting gift since he was given the second chance.

In the story of I Will Not Break, Inoichi is basically deteriorating rapidly and he becomes essentially a zombie of sorts. Somehow alive. It starts slowly, with joint pain that’s worse than normal arthritis. Then, on Tsukiya’s birthday just before the explosion at Intel, he finds himself coughing up blood. At the hospital, he finds out he’s dying all over again. His lungs show that he’s not 43 years old, but in his 70s despite his outwardly appearance. He spends a lot of the time trying to act like everything is fine but secretly, he’s afraid of dying before he’s ready again.

Sensor Type Training

One day in casual conversation, Ibiki mentioned to Inoichi that Tsukiya had a knack for sensing chakra because of how sensitive they are to a lot different things. Inoichi pointed out to Ibiki that meant they were a sensor type shinobi and asked how reliable were their senses. When Ibiki admitted they were mostly winging it, Inoichi knew he would need to help them to hone in on these skills as well as how to suppress them so they don't get overwhelmed.

Analysis

Little did Inoichi know, he was teaching Tsukiya to fill his shoes when he's gone. He taught them psycho mind transmission, how to do the different parts of analysis, and how to use their sensing nature. When he's a ghost, he stands proudly watching them taking over his role, and when he's alive again for a short period, he struggles to reconcile he's not the head of the Analysis division anymore—that was Tsukiya's job now.

Danzō has played such a massive role in Tsukiya's life, to say that he is the reason they're alive isn't even an exaggeration. When Kakashi was about 18, Danzō knew at some point Kakashi would betray him. So in an attempt to control Kakashi, Danzō had a woman named Setsuna meet with Kakashi. The plan was simple: if Setsuna could trick Kakashi into loving her, then he could get her to have a child with Kakashi and maybe it could force Kakashi to . Surprisingly, it worked rather quickly and before they knew it, Setsuna was pregnant with the Hatake heir.

When Setsuna was a few days away from giving birth, Danzō used the First's wood release to help her bring Sakumo to life and stay alive for many years to come. This was so Setsuna could fake her death and escape the village while Kakashi had someone to help raise the child. And it worked. Though, Danzō did not think that Kakashi would take to being a father as well as he had, but he did. And as Danzō watched them, he realized he no longer wanted to control Kakashi, but he could see Tsukiya becoming the tool he needed.

In Fire and Ice, he is the man at the computer looking at the different screens and watching Tsukiya from afar. At the end of The Hidden Beast, he bumps into Tsukiya—now six months after the initial infusion with their beast and back on regular missions. He knew at this point that Tsukiya was ripe for harvest—he needed them in Root. But he knew he couldn't have them without Hiiragi. Thankfully, Hiiragi had his own uses. At first, he adopts a kitten for them and leaves a note on their desk at Intel that was set to explode after reading.

In Letting Go, Danzō forces Tsukiya's hand to get them to join Root. Two weeks after the note at Intel, he crashes Tsukiya and Hiiragi's dinner date at Ichiraku's and pays for their dinner with extra money left over. During this time, he spikes their drink with saké, sending them home tipsy and exhausted since alcohol makes Tsukiya tired. Next, he tries to get them by buying a plushie they wanted. Finally, he places their grandmother, Murasaki, under a genjutsu. And that was the final straw for Tsukiya.

Before the invasion of Pein, Danzō tested Tsukiya again, but didn't reveal his reasons until much later—to make sure they were ready to take his place as Root leader if something were to happen, such as him becoming Hokage. After the invasion, he placed them in his spot as the leader and allowed them to run Root as they pleased.

His death was hardly the end, though. Once Tsukiya could start seeing ghosts in Castle of Glass, he knew what he had to do: continue to harass them. He possessed Sakumo's body, kicking Sakumo out. Though, he did not plan to immediately be caught by Ibiki and then yanked out of the body by Hiiragi and Ino, then placed into the body of some unfortunate prisoner.

In I Will Not Break, Danzō breaks free of Ino’s mind prison and takes over the poor prisoner he was trapped in. He then escapes the prison and remains as a background threat to Tsukiya until the next unnamed story.

Ibiki is Tsukiya's sensei and their other dad. He very much cares about them and wants to keep them from making the same mistakes he's made over the years. Unfortunately, they are very stubborn. Despite their mistakes, Ibiki remains extraordinarily proud of his pupil.

Tsukiya and Shikamaru are comrades and although they're not close friends, they are definitely friends and Tsukiya trusts Shikamaru's judgement on a lot of things. They have a relaxed friendship

During the events of Castle of Glass, Shikamaru, Chōji, and Ino help guard Tsukiya as Kakashi's stand-in and as someone being targeted for their jinchuriki. He is also the one who found Hiiragi after Setsuna's attack and got him to the hospital. Shikamaru also helps Tsukiya with Danzō's interrogation—and much to their chagrin, he was the one who recorded the whole thing and showed it to Kakashi and Sakumo.