You can find four Ribbons (one for each character) in the World of Darkness. These are essential for protecting against the "Bad Breath" status ailment used by end-game enemies.
Head here after defeating Hein to receive the next set of objectives . Final.Fantasy.III.MULTi10-PLAZA.rar
Which are you playing (Pixel Remaster or 3D Remake)? You can find four Ribbons (one for each