Miyashita Naoki is the voice of Doumyouji Tsukasa in Hana Yori Dango. Wow, is it difficult to dig up information on him! He was a teen idol-type in the early 1990s, and has been in a few live action doramas (and yes, is it strange to hear Doumyouji's voice coming out of a real life person's mouth ^_^;) He also played none other than Onizuka in the 'Shonan Junai Gumi' movies. 'Shounan Junai Gumi' is originally a manga series by Fujisawa Toru, the author of the imensly popular GTO series. 'Shonan Junai Gumi' was done before GTO, and follows the adventures of Onizuka BEFORE he decided to become a Great Teacher, back when he was a gang member.