Roxas is half of Ven and half of Sora. What happen to Ven is Master Xenhort looking for a younger vessel trained him to harness the darkness, Ven failed miserably so Xenhort cut his heart into two. This darkness became Venentus, while Ven was left commotose and dying.
Xenhort took his body to Denstiny Island so he could die in peace a lot act of mercy for his failure, but while Ven was leaving the world his heart came into contact with Soras heart which was entering. Sora lent Ven his power and Ven recuperated. Xenohort came up with a new plan get Ventus strong again and have him fight against Ventius to form the X-blade, while Xenohort would go after Terra for his new vessel.In the end of Birth By Sleep Xenohort succeeds in possessing Terra and becomes the villian Sora fights in the orginal 2.
However to keep Xenohort from receving the X-blade Ventus sacrfices himself. S body becomes commotose and is put in a secret chamber in Castle Oblvion that only Aquas can open. S heart and soul return to the boy who saved him earlyer, in this case Sora.
When Sora lost his heart to save Kairi Vens heart was still inside him but with no memory of his former life when Sora's body reappeard has Roxas. Hence Roxas is both Ven and Sora.It is also why Sora's default keyblade resembles one half of the X-blade. A nobody of course is a being that is born when a heartless takes a heart.
A person without feelings and emotions however Roxas was born thourgh the process that it takes to become a nobody but he still has Ventus heart. Hence he can feel and his emotion has rubbed off on Axel who does feel real friendship twords him.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.