The group's name was an acronym based on the first letter of each member's family name until the departure of Jin Akanishi in 2010, and Koki Tanaka in 2013.
[1] In 2001, he was grouped up as KAT-TUN for NHK program "Pop Jam" to backdance for Kinki Kids' Koichi Domoto.
[2] A new version of his solo concert tour, "MOUSE PEACE uniting with FiVe TATSUYA UEDA LIVE 2010", was held from August 4 – October 3, 2010.
[3] He announced in his Instagram and fan club that, after 13 years, he would have his solo tour "MOUSE PEACE 2024", which will take place starting in Zepp Sapporo on January 6, 2024.
In October 2013, it was announced that Ueda would be starring in a stage play in 2014, titled "Tōmin suru kuma ni soine shite goran".
[9] Ueda reported in an Instagram post on December 10, 2023 that he and Sakurai were working on a pair of songs for his solo concert tour "MOUSE PEACE 2024".