Korekiyo and Kokichi have scarce, though usually rather entertaining interactions.
There is a bonus scene in Chapter 2 where Kokichi and Korekiyo, as well as some of their classmates, go to the casino. There is also a scene where Kokichi prodded around Korekiyo's Ultimate Talent Research Lab only to warrant Korekiyo's anger, prompting Kokichi to put on his pitifully-crying facade. Korekiyo actually threatens to tear out his nerves, which appears to unsettle Kokichi a bit.
Later on in chapter 3, after a body discovery announcement played, Korekiyo suggested a seance to speak with the victim and figure out the truth from there. While the others started out repulsed to the idea, being creeped out, Kokichi was the first to volunteer participation in the seance. Kokichi, along with Shuichi, Himiko perform the seance with Korekiyo leading it. Although, Kokichi was unaware of Korekiyo's motives.
In Ultimate Talent Development Plan, Kokichi has an interaction with Korekiyo. Kokichi goes to a haunted house, but he has a problem with the reception desk, which was being manned by Korekiyo. Kokichi says that the receptionist sets the mood of the haunted house, but Korekiyo was too scary. Korekiyo says that to set the right mood, he's been telling different scary stories, and Kokichi is upset that he didn't get that service. Korekiyo says his stories would have been wasted on Kokichi, and Kokichi becomes disappointed.
Shinouma is not very big in the fandom, as both are included in more popular ships (Oumasai & Oumota for Kokichi and Amaguji for Korekiyo). However, on AO3, Shinouma is Korekiyo's 8th most popular ship.
The ship sailed mainly because of the boys' contrasting personalities. Kokichi is mischievious and somewhat childish, while Korekiyo is mysterious and is mature. Fans believe that they would get along well because Kokichi does not like boring people, and Korekiyo is anything but. Similarly, as an anthropologist, Korekiyo would find himself curious about Kokichi and want to know more about him like why he lies so often.
- Both talents involve people; Korekiyo studies them and Kokichi leads them.
- Both like the following presents:
- Astro Cake
- Book of the Blackened
- Feelings of Ham
- Travel Journal
- Tattered Music Score
- Proxilingual Device
- Potted Banyan Tree
- Dancing Haniwa
- Weathercock of Barcelous
- Pillow of Admiration
- 46 Moves of the Killing Game
- Monkey's Paw
- Dangan Werewolf
- Oma Kokichi/Shinguji Korekiyo tag on AO3
- Oma Kokichi & Shinguji Korekiyo tag on AO3
- Oma K./Shinguji K. on FanFiction.Net