The Western Princess, he is a confident boy and doesn't have many problems with dressing up like a girl in front of other people. He constantly likes to tease Mikoto because he thinks it's fun how Mikoto reacts. He has distanced himself from the rest of his family because he thinks that his mother, step-father, and younger half-brother together are the "perfect family". As the series progress, Yuujiro become quite close to Toru. Toru is the first person he ever opened up to. He and Toru often team up against Mikoto when Mikoto is at odds with them concerning Princess duties. This gets Mikoto to end up agreeing with them, especially since they hold leverage over Mikoto who doesn't want his girlfriend to find out about him being a Princess. Apparently, Yuujiro's idea of a girl for him is one with a perfect figure.
Source from Wikipeida