In recent years, the emergence of retailers such as mobile commerce has resulted in fierce competition in the retail market. This study has three objectives. First, it develops store personality scales for a department store, hypermarket, and mobile commerce. Second, it investigates the relationship between store loyalty and store personality. Third, it compares different store personalities of a department store, hypermarket, and mobile commerce. The relationship between store loyalty and store personalities depend on sophistication (department store), excitement (hypermarket), and competence (mobile commerce). These findings might help retailers establish effective communication strategies in competitive differentiation.