This study assessed the personality of severely ill patients with anorexia nervosa, restricting (AN-R) and binge-purge subtypes (AN-BP), during hospitalization for medical stabilization. Participants (N = 37) completed the Temperament and Character Inventory, Revised. Personality domains were similar between AN-R and AN-BP with the exception of cooperativeness. AN-R patients scored higher on this dimension, suggesting that individuals with restricting anorexia may be more tolerant of treatment during early medical stabilization. Future research is needed to further elucidate this novel finding in order to identify the point at which body mass index predicts a decline in cooperativeness and the potential need for new intervention strategies.