Ruyo

Ruyo is the het ship between Rudo and Riyo from Gachiakuta fandom.

Canon
Rudo and Riyo first meet inside a Jeep that was heading towards the Cleaner's HQ, Enjin questions Riyo on when she got inside the vehicle, Riyo answers by saying that she "wanted to see the new kid" which was Rudo, Riyo then asks Rudo if he was the newcomer, in which he says yes. Afterwards Riyo suddenly touches Rudo's hair and says that she's fascinated with it, even asking Rudo on whether its dyed or not (Rudo says its natural), while Riyo was playing with his hair, Rudo on the other hand was flabbergasted by the mere fact that a girl was playing with his hair so suddenly in their first interaction.

After finally arriving on the HQ, Riyo nonchalantly walks out of the jeep humming as Rudo steps out feeling stunned by the situation that just occurred, when Rudo and the cleaners meet up with their receptionist Semiu, Riyo says bye to Rudo, while Rudo in his mind questions if Riyo was "gonna rough him up again".

Later on when the Enjin and Rudo realize that the boss isn't around, Riyo makes a humble request to have Rudo do an observation on how the cleaners do their work, even coming close to Rudo's face and saying "I want to know you better Rudo, please?". When they arrive on a polluted zone being invaded by Aberrant beasts, Rudo is shocked by how many strong enemies there are, to the point where he questions Riyo on how she can be so calm in a "life or death situation", Riyo happily replies by saying that to live on the ground, its important to have a calm mind, which when Rudo hears, he gains some bit of courage.

Shortly after their conversation, a giant Aberrant Beast appears and attacks the cleaners, Riyo is amazed by the weird monster and uses her Vital Instrument to fight the Aberrant beasts while Rudo watches from the sidelines as he's astonished by Riyo's fighting skills, one of the supporters Griss then explains that Riyo's Vital Instrument is a scissor that enlarges itself to be used as a weapon, scissors are generally used by hands, but Riyo uses her feet to use them. Afterwards Griss tells Rudo to stop slacking off just because he's only there to observe their work, suddenly an aberrant beast appears behind Rudo to attack him, but Griss saves Rudo's life by stopping the beast and throwing it towards Riyo, where she slices it in half, the rest of the supporters start helping out in the battle as Rudo watches them in the sideline, being amazed at their critical teamwork, as he watches he starts feeling left out and useless.

When Riyo slices the giant Aberrant Beast and the Supporters defeat the rest of the smaller ones, all seems fine until another beast appears beneath Follo and sneak attacks him, when the beast is going to attack, Rudo jumps in instantly and saves Follo's life by stopping the beast from attacking, he then says that he won't let himself be a hinderance and that he'll show them his own strength, but then a problem occurred, Rudo realizes that he doesn't remember how to properly use his Vital Instrument, the Aberrant beast then tries to attack Rudo but Riyo jumps in and attacks the beast, saving Rudo's life. Riyo then praises Rudo for instantly saving someone's life, and that he did a good job.

Moments

 * When they first meet, Riyo plays with Rudo's hair.
 * In chapter 7, Riyo eagerly tells Rudo that she wants to know him better.
 * In chapter 8, Riyo calms down Rudo when he's sweating over the Aberrant Beasts.
 * Riyo threw a welcoming party for Rudo.
 * In chapter 21, Riyo is shown being relieved to see that Rudo was doing fine after he got attacked by the Vandals.
 * In chapter 23, Riyo abruptly enters Rudo's room to show him around the Cleaner's HQ.
 * In the same chapter, Riyo tells Rudo that they have sweets, later when Rudo is shown being mesmerized by the sweets, she eagerly tells Rudo to try it out, to which he does and ends up getting addicted to it due to him never eating something so delicious before in his life.
 * In chapter 25, Riyo is shown laying on Rudo's bed, Rudo is surprised by the random intrusion and questions her on when she got into the room, to which she says that her room is right above his. Riyo explains that the reason why she entered his room was because she heard him groaning in pain and that it made her worried.
 * In chapter 44, Riyo is shown sleeping on Rudo's shoulder in the background.
 * In chapter 46, Rudo comments about the fact that Riyo drank from his cup.
 * In chapter 47, When Rudo is about to get kidnapped by the Vandals, Riyo is shown to express the most distress out of all the other characters.
 * In chapter 64, Riyo thinks about all the memories she spent with Rudo, she then says that Rudo(?) should've just forgotten all about that Amo girl, (dialogue varies depending on which translation is used, the official one has Riyo talking as if she meant Rudo)

Quotes
"Your hair is awesome! did you dye it?"

- Riyo

"A.. a girl.. is playing with my hair! is this what life is like on the ground?!"

- Rudo's reaction when Riyo started playing with his hair

"Rudo, you look better than I thought! thank goodness!"

- Riyo "Besides, I wanna get to know you better Rudo.. please?""

- Riyo

Fanon
Due to Gachiakuta currently having no mainstream popularity, not many people have been shown to ship Rudo and Riyo, with only a handful of people seeing the hints between the two's relationship and theorizing about them possibly ending up together in the end of the manga.

When it came to Rudo's design and personality, some fans thought that he might be younger than 12-13, which caused some fans to be heavily against shipping Rudo and Riyo, since most of the fanbase speculated that Riyo might be way older than him, either in her early 20s or below 19.

It was then confirmed in the volume 7 extras that Rudo is 15, while Riyo is 16.

Trivia

 * According to the volume 7 extras of the manga, Rudo likes sweets and dislikes spicy food, while Riyo likes spicy food and dislikes sweets
 * Rudo is constantly timid towards Riyo whenever they spend time together
 * Kei Urana (the author of Gachiakuta) drew a halloween sketch of Rudo and Riyo in costumes