Kokichi Oma

Kokichi Oma is the Husband of Byakuya, and lives with him and Makoto on an alternate island in an unknown area.

Monokuma allowed him and Byakuya to live elsewhere, as they were the only ones who were able to figure out how to escape the library. Makoto lives with them for unspecified reasons.

Personality
Kokichi is somewhat selfish, not caring for a lot of people on the island, probably due to the fact he doesn't have a chance to interact with most of them since he doesn't live on Jabbercock Island. He rarely comes to the island either. He's one of the only known people with the ability to leave and enter the island at will.

Byakuya Togami
Byakuya is Kokichi's husband. During the time and the library, they both dumped Rantaro and got together. They were often heard having sex under a library desk, but it was later revealed that they were actually plotting an escape from the library. Though this is debatable, mostly because of the fact that other people claimed they heard weird noises like moaning coming from under the desk, and because of the reason that Byakuya 'lost' his glasses.

During the time at their island in an unspecified location, they also often have sex. Makoto talks about all of the weird noises he hears from their bedroom while he's moderating. Byakuya often refers to Kokichi as sweetums, and is overall very affectionate to him.

Rantaro Amami
At some point in their time during the library, Kokichi was in Rantaro's harem (along with Korekiyo, Byakuya, and Gundham). Eventually Kokichi and Byakuya fall for each other. As a result, they get together instead, and Rantaro is cucked. They both claim that they were only in it for the money, and Rantaro's dumpy is fake as fuck. As a result, Kokichi gains a very strong disliking toward Rantaro, and is often mean or rude to him.