|“||Princess... Are you a bit tired? There is no one right now, so how about lying down for a bit? Don't worry, I'll wake you up if someone comes... Right. You can fall asleep with your head on my lap. My thighs are quite soft and it seems they feel good. Or perhaps you want to use my arms as a pillow?||”|
As not only the older but also calmer twin of the Teramitsu twins, Yuduki is the complete opposite of Haruhi. He may not be as outgoing and confident as his younger sibling but he always helps where he can and takes in advice from his seniors to become better.
Yuduki has an average height and a rather delicate build. His black hair parts to the left side with the back being slightly longer. He shares the same eye color as Haruhi, deep blue with a tint of yellow as the highlight. He has a mole on the left side of his neck, as well as a pierced left ear.
He often wears comfortable clothes such as sweaters or cardigans.
Yuduki is a very soft and gentle boy. In addition, he is also down-to-earth. Even when he is praised for his work there is no sign of arrogance but only modesty. He is talented in art and enjoys peaceful activities such as reading.
When he gets too immerse in reading, he becomes unaware of the things he does, like wearing Haruhi's clothes or taking off his pyjamas and wearing Haruhi's after.
While he is proud of his younger twin, he often worries about him as well. Haruhi tends to make rash decisions so Yuduki always keeps close to him aside from enjoying his presence.
|The Teramitsu twins were born in England and taken in by their grandfather after their mother died. They lived in a Japanese style home in their childhood. It was said by Miroku that both take after their British father but the attractiveness comes from their mother.
During their childhood, Haruhi was often sick and could not go out much. Since Yuduki couldn't spend time with Haruhi, he would get bored when he was alone. Hence he would spend his alone time fully immersed in reading books.
Goshi, Yuduki and Haruhi are known as the Returnee Trio. Probably because they had lived abroad, three of them are quite close and would sometimes communicate in english. They often hang out with each other in one of the twin's rooms during their days off, with Goshi sleeping over sometimes.  Goshi will also sometimes escape to their room.
Goshi is a caring senpai towards them, and often fulfills their requests such as driving them to places like the Aquarium. Even when he doesn't want to, the twins will eventually convince him with Yuduki's puppy eyes. Other than taking care of Haruhi when he wasn't feeling well, he would also tell Haruhi off for not cleaning his room.
In return, the twins would declare their love for Goshi, saying that "It's not 'like', but 'love'".  Haruhi would sometimes make Goshi's favorite food, curry, for him. Haruhi mentions that he would like to go drinking with Goshi once he is of legal drinking age and received a hand-me-down shirt from Goshi which Goshi wore for the cover of MY★STAR vol.6 Magazine.  Yuduki states that Haruhi takes good care of it.
Being twin brothers, Yuduki and Haruhi have a very close relationship with one another. The two were always together. However, this was not the case when they were younger. The twins lost their mother at a young age and were taken in by their grandfather. Haruhi often fell sick, so they couldn't spend as much time together. Due to his sickly body, Haruhi didn't had any chance to make friends, but he didn't felt lonely as he had Yuduki by his side. 
During an overnight camping trip, Yuduki reminded Haruhi to put on some sun-screen. However, Haruhi did not do so and by the evening, he had sunburns on his arm. Yuduki notices it and makes a fuss and this leads to an argument between the two. Afterwards, when Haruhi and Yuta got lost in the forest, he reveals to Yuta that about his past and how Yuduki was always the one to take care of him. Haruhi wanted to protect Yuduki in return for all he has done for him. Eventually the two were found by Yuduki and Goshi by using Yuduki's twin sense, and the twins apologized to each other.
Whenever there's a topic about butts, Haruhi will state that Yuduki has the best butt, with its indescribable springiness and softness.
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|Refers to "him/her"||Yudu /Yuduki||Yuduki||Yuduki||Yudu||Yuduki||Yuduki|
|Refers to "them"||Kitakado-san||Korekuni-san||Kaneshiro-san||Ashu-kun||Aizome-san||Masunaga-san|
|Refers to "him/her"||Yudu||Yu-chan||Yuduki||Yudurin||Boku||Yuduki|
|Refers to "them"||Onzai-san||Hikaru-kun||Nome-san||Mikado-kun||N/A||Haru|
|Refers to "him/her"||Yucchii||Yuduki||Yuduki-kun||Yuduki||-||Yuduki|
|Refers to "them"||Akane||Tono||Tsubasa-san||Yashamaru-san||-||President|
|Yuduki's name derives from Gakkō Bosatsu(月光菩薩), one of the Bodhisattva in the Japanese Buddhist Pantheon.|