Ultimate Imposter met Ryota Mitarai prior to the events of Despair Arc, after the latter collapsed on the floor in a hallway. After doing research on him, Imposter suggested he'd take Ryota's identity so that the Ultimate Animator could focus on working on his anime. Imposter has been visiting Mitarai ever since, bringing him food and drinks.
In Episode 5, after Ryota neglected his health again, Imposter brought Mikan Tsumiki to nurse him back to health. After doing that, Imposter shared their secret with her. The two have been visiting Ryota together ever since.
In Episode 8, after being brainwashed by an early version of Junko Enoshima's Despair Video thanks to Mukuro Ikusaba's lobotomy on her, Mikan attempted to have sex with Ryota while explaining the video to him.
In Hope Arc, both Imposter and Mikan, along with their other classmates and Hajime Hinata/Izuru Kamukura - all of whom now free of the effects of brainwashing, told Ryota to join them in atoning for their sins on Jabberwock Island. The group forgave each other their past mistakes, implying Ryota's friendship with Mikan has been restored. Meanwhile, his friendship with the Ultimate Imposter has already been shown to have been restored, with the Imposter giving Ryota a hug after the latter bursts into tears, being grateful to his classmates for forgiving him; as well as when they hang out together on the ship with Ibuki Mioda.
In Ultimate Talent Development Plan, the non-canon bonus mode of New Danganronpa V3: Killing Harmony, there is an event where Ultimate Imposter brings Hifumi Yamada to Mikan after the Ultimate Fanfic Creator had been overworking on his doujins. Imposter comments that he had Mikan help his friend in a similar situation, meaning the trio's friendships in the universe of this bonus mode are similar to the ones from Despair Arc, with the only exception being Imposter still being disguised as Byakuya Togami.
The polyship resulted from the canon friendships between all three characters included. Although Danganronpa 3: The End of Hope's Peak Academy received mixed feedback, the friendship between the trio was one of the most well-received parts of. In spite of this, it's usually just Mitworai which gets recognition, whereas the other dynamics often get overlooked by the fans who focus on characters between more prominent characters with more screentime. Twomiki also receives a little attention as a result of several ship tease moments, though.
This ship is a results of the fans not being able to choose between Twomiki, Mitworai and Mimiki, and/or liking the dynamics between the entire trio. Its main ship rival is another polyship including most of characters from this trio - Mitwobuki. While this polyship does receive quite enough of attention in spite of being a rather minor one, its generally considered as wholesome dynamics between the three characters often result in the trio being preferred as a platonic friendship rather than a romantic polyship. Its popularity might also be decreased for similar reasons as Mimiki, by the fans who don't forgive Mikan's attempted rape on Ryota in spite of her being brainwashed at the time.
This ship is often compared to Twilight Syndrome Girls, as both feature Mikan Tsumiki in a group with her close friends. Usually, this group is preferred over the latter as a result of the Ultimate Imposter and Ryota's genuine care for her, which was shown in several episodes of Despair Arc featuring their friendship, especially through the Imposter's actions and worries. This is contrasted with the other group's lack of action in regards to Hiyoko Saionji's consistant bullying of Mikan in spite of being in a social circle of supposed close friends. Nonetheless, the girls' squad might win in popularity for those who are only familiar with the second game and have yet to watch the anime.
- Ryota/Ultimate Imposter/Mikan tag on AO3
- Ryota Mitarai & Mikan Tsumiki & Ultimate Inmposter tag on AO3
- Ultimate Imposter/Mitari/Tsumiki tag on FanFiction.Net
- Mimiki refers to the ship just between Mikan and Ryota.
- Mitworai refers to the ship just between Ryota and the Ultimate Imposter.
- Twomiki refers to the ship just between Mikan and the Ultimate Imposter.