Joshu is a 19-year-old college student and the third of Norisuke Higashikata IV's four children. Entitled, loud-mouthed and self-absorbed, Joshu is the archetypical spoiled teenager.

One of Joshu's most prominent traits is his general unpleasantness. He is rude and disrespectful to not only his regular entourage but also most people he interacts with. In general, Joshu is quite vulgar and regularly insults or disparages those he interacts with. Partly out of resentment, Joshu regularly bad-mouthes Josuke and has at one point mocked him for not having a family.[6] He also has a habit of bantering and playing pranks to his sister Hato. When Hato reveals her unattractive boyfriend, Tamaki Damo to her family, he immediately chuckles at the sight of Damo[7] and also consistently acts rude to his guest. Finally, when Kaato Higashikata revealed herself to her family, Joshu was hostile to her and made it a point to humiliate her by disassembling her clothes (though this was notably in retaliation to her forced entry and insults of his hair).[5] Yasuho notes that Joshu has poor social skills, which is at odds with his educational pursuit of social studies.