Sora was a Fu-Ma ninja but he went rogue and left he wields a zanbato that looks exactly like the glam he wishes to obtain both Soul Calibur and Soul Edge so he can create a new world free of evil.
Soul Calibur IV
He hears about the azure knight appearing in Orthensberg and he thinks this is his chance to collect Soul Edge! then hears Siegfried has been seen there too! and says "YES this is my chance to get both swords and cleanse the world!!!!!"
Ending Soul Calibur IV
He has obtained both swords and says "finally the moment of truth has arrived" both the swords glow and the screen fades to black and the text says and the world was cleansed of all evil.
(feel free to make any spelling errors and add missing article but only edit the existing articles unless its totally necessary)