For Elena: the book should be mediocre if Elena is depicted in an affectionate way, and it is the reflecting and deploring tone that makes this girl sincere, flawed yet display her own goodness. When we read this novel, we must not omit the brilliance of this self-effacing protagonist.
For Lila: she is the one who can easily turn you against her enemies and assume sympathy with her. Brilliant, insightful, truly vigorous and admirable.
For Nino: maybe mad love or loves make him alive.
For Pietro: genuinely a good scholar, a kind yet fragile husband, and above all, an innocent and pushy person who is afraid of abandonment.