Usopp Meets His Father. Mainly after they fought together. I believe the Usopps fascination for the Giants and the aventures desire comes from his father.
At this point in the series it seems that Yasopp Usopps father is not currently aware that his son is a pirate but I am very certain that at some point he shall learn of this and I think that he shall be pleased when he does. Nov 1 2007. Obviously he would want to see his father but you always got the feeling that.
But most of all Usopp couldnt forgive Luffy for being able to spend time with his father.
May 2 2019. Mainly after they fought together. Usopp greatly respects his father and has inherited his phenomenal marksmanship. There is only one member that Luffy wanted to recruit before meeting him and intended to make him join his crew and it is Zoro.