 He is often bullied in some sorts by his older siblings, Ryoma and Momoko (Momoshiro).In the musicals, Kaidoh has been portrayed by Naoya Gomoto (2003-2005), Kousuke Kujirai (2005-2006), Tomo Yanagishita (2006-2008), Yuuichirou Hirata (2007-2009), Akihiro Hayashi (2008-2010), Ryousuke Ikeoka (2010–2012), Tatsunari Kimura (2012–2014), and Hiroki Sana (2015-2016).is the coach of Seigaku's tennis club and one of the school's math teachers.