Yui's dolls, in her bedroom in back story on Episode 10, come from 'Air' and 'Clannad'. The title of the episode Yui dissapeared in is "Goodbye Days" which is also the title of the main song YUI sings in Taiyou no Uta. Her back story seems to be a reference to Taiyou no Uta, a movie that the singer YUI starred in. The song played during the scene where Hinata helped Yui to fulfill her last achievement (get married) was " Ichiban no Takaramono", which was later re-used in Episode 13 (Otonashi confessed his feelings towards Kanade), albeit with slight modifications like the song being played on piano rather than guitar and a different singer. It seems that she doesn't know Naoi as what she stated on Episode 08. Yui is very similar in appearance to Etna from the Disgaea series. In the special opening credits focusing on Yui (and which doubles as Yui's audition performance), she is playing a Gibson SG Special. She has caught Fujimaki with a heavy kick in a soccer game and Hinata in the second Guild Descent Operation. However in non-combat situations, she displays surprising ability in wrestling (her favorite is "German Suplex " and she did this to Otonashi). Yui has little combat ability to the point even Yuri does not rate her as an effective threat against Angel, merely as a general distraction. Her upbeat personality is most likely inspired by her past life in the living world where she was paralyzed since she was four years old from head to toe. She is also a huge admirer of Hisako, because of her 'murderous' guitar gift. She is often flirtatious with others, and takes advantage of every opportunity she can. She usually tells the other SSS members that they're "morons", mostly because under the surface she is actually quite intelligent. 
Even within the members of the SSS, she comes off as very excited and loud. She is known to be hyperactive and talks extremely fast.
Yui is extremely bright, cheerful, crazy and even a bit wild. She also has two pointy teeth like a cat. Another particular trait of her is her "demon tail" which seems to twitch and move whenever she is excited, happy, or emotional in any way. She wears wings that are hidden behind her hair. On her wrists she sports single handcuffs with few slabs remaining on each (possibly, both parts formed a common pair of handcuffs).
Though they don't seem to be in use, she also wears garters on each thigh with the addition of black choker around her neck.
She wears crossed black ribbons up to her knees and black boots. She wears the same uniform as Yuri and the other girls, although her shirt appears to be small enough to see her belly. Yui has long, pink hair with two bunches tied up with dark red laces, and two twintails on the sides of her face, held together by small cross-shaped barrettes.
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