Those three are Riku's (Left), Sora's (Center), and Kairi's (Right) Ancestors. The shadowed man is the ancestor of Xaenhort. The KeyBlade wars were fought between Xaenhort's Ancestors' and S,R,&K's people. Roxas' Ancester appears to fight on the good side, but dies in the battle. His spirit reincarnated into Roxas. The good guys win, and the keyblades were scattered among the worlds (this is why your are rewarded with them in different areas). The game takes place 300 years before KH 1&2