- As a child, he witnessed a man being killed.

- He went to an all-boy's school.

- He used to wear a necklace that Jrock star Gackt gave him.

- He joined the Johnny's because he admired Tsubasa Imai so much.

- He is a sensitive person, and is easily hurt by what others say.

- Band-mate Jin Akanishi ,who joined Johnny's 6 months after Ueda, thought hat Ueda was a senpai of the same level as Hideaki Takizawa.

- He was once talent-scouted by another talent agency.

- Band-mate Kazuya Kamenashi, befriended him when they formed KAT-TUN and always looks out for him.

- Ryo Nishikido from NEWS/Kanjani8 is sometimes cruel to Ueda. After Kazuya Kamenashi asked Ryo not to question Ueda about his ambitions, telling him that Ueda gets upset that he isn't sure about it, Ryo publicly questioned him again. Then, early this year, Ryo announced that he hates Ueda most of all the Johnny's. However, it has come to light that this rivalry was actually started by Shônen Club, a Johnny's Entertainment variety show. Despite the fact that the rivalry was mostly scripted, Ryo (famed for his cutting remarks) has admitted that he might have taken the incident too far by not thinking before speaking.

- He learned to play the piano as a child, but now prefers the guitar.

-He speaks/is learning both English and French (the same as his idol, Gackt).

-He used to want to be a teacher, but decided against it after realising that he might be assigned to an all-girls school (he says he would be too nervous).

-His current long-term ambition is to direct classical music, while at present he has a share in creating KAT-TUN's music.

- He wants to name his future daughter "Elizabeth", but because Japanese people would find it difficult to pronounce, he'd shorten it to "Eri/Eli".

- on the basketball team in school, he says he was very good.

- He sometimes wears blue contact lenses.

-He is most famous for his song "Love in Snow" sung during KAT-TUN's Kaizokuban concert.