Investigation Team

Investigation Team is the friendship between Yu Narukami, Yosuke Hanamura, Chie Satonaka, Yukiko Amagi, Kanji Tatsumi, Rise Kujikawa, Teddie, and Naoto Shirogane from the Persona fandom.

Persona 4
Chie and Yukiko are close friends from childhood, who also appear to be on a friendly basis with Yusuke. When Yu arrives as a new student at Yasogami High School, Chie takes to him quickly. Chie, Yusuke, and Yu begin to hang out after school. One day Chie tells Yu about the Midnight Channel, and the three friends visit Junes to take a look at a larger TV. They end up getting sucked into the TV world, where they meet Teddie and experience the shadows of the world. Upon returning to the real world, they start to realize the true meaning of the Midnight Channel. When Yukiko appears on it next, Chie is determined to save her with help from her new friends.

Using the power of their personas, the trio save Yukiko. Now that she knows about the existence of the TV world, she joins their team. The next victim is Kanji, a first year student who is a known "rebel". They rescue Kanji, and he joins the team. The first and second year students go on a school camping trip, with Yu, Yusuke, Chie, and Yukiko making up one group. Kanji spends most of the time hanging out with them, saying the kids in his own grade are boring. Kanji, Yu, and Yusuke start off sharing a tent, but the boys admit they are uncomfortable with Kanji. He storms to the girls' tent, but Chie knocks him out. They leave him behind, and run to sleep in Yu and Yusuke's tent for the night.

The next victim is Rise Kujikawa, a former idol. The Investigation Team goes into the TV world to rescue her, but her Shadow is overpowered and can predict their movements. Teddie takes this opportunity to run into the situation, defeating Rise's persona. However, this manages to awaken Teddie's own Shadow whom the Team must defeat. Once they do, Teddie is granted his own persona. He decides to leave the TV world, creating himself a human body and venturing into the real world. Both he and Rise officially join the Investigation Team.

The group attends another class field trip, this time to Tatsumi Port Island. The boys share a hotel room (much to their chagrin) and the girls share a hotel room. While out for the day, the Team bumps into Naoto Shirogane, a teenager called the "Prince Detective". Yu suggests that they invite her along with them, as she's a new student and seems lonely. They head to a night club where they are served free food and drinks thanks to Rise's career as an idol. They play The King's Game, but a drunk Rise, Yukiko, and Yu manage to derail it a number of times. Naoto opens up to them slightly more during the course of the game.

Fanon
The Investigation Team is a beloved friendship in the Persona franchise. Many fans enjoy the bond that the eight characters formed with each other, as well as the smaller bonds formed within that. They appreciate how realistic the friendship feels, and some believe it even reminds them of their own high school days. While this is primarily a friendship, there are some fans that ship the characters in a polycule (typically without the inclusion of Teddie). Typically, however, the large friendship is split into smaller romantic ships, such as SouYo, YukiChie, and KanNao.

There are currently over 600 works on AO3 tagged with "Investigation Team".

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Trivia

 * Specialized Extracurricular Execution Squad and Phantom Thieves are the Persona 3 and Persona 5 equivalents of this ship, respectively