For him, the crux of the Boccaccian story of the two friends is not jelousy, but that "un amigo se sacrifica para liberar a otro de una muerte segura, y los dos amigos se enamoran de la misma mujer" (19).
Bad character would be an absence of good traits, or even a collection of recognized bad traits, such as selfishness, cruelty, avorice, jelousy, hostility, etc.