probably N-. In the story he had childhood febrile illness so must have had brain damage since he is so unlike the other Corleones who appear to be low temperament N in the case of Vito and Michael and high temperament N or NA in the case of Santini and his mother. ABO A seems to be right for Michael, Vito and Fredo while ABO O seems to fit Santini and his Mother as well as his sister.
In regards to Fredo's childhood illness that caused brain damage, ABO A types are more vulnerable to most common viral infections as well as to resultant vascular damage to brain.
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