The three crossword solutions for the term 'fraternity characters' are NUS (3 letters), PSIS (4 letters), and RHOS (4 letters). NUS stands for National United Sororities, which is a national organization of women's fraternities. PSIS stands for Panhellenic Sorority Interests Society, which is an organization that provides support and resources to sororities. RHOS stands for Rho Sigma Honor Society, which is an honor society for members of sororities.