Kusonoki is the greatest great grandfather of the Masashige line, because of the witch who he haven't sealed, he's bloodline was cursed, making him the first victim, he originaly was tricked by the witch my Shaku, he's daughter, even if he defeated the 3 beasts. He is very wise, and rather old. (443 years old, due to the curse. Even though mentally he is 43), he is also very skilled as a warrior and can be a very good parental figure. He's still wise, knowing how to handle situations like adult.