For the Vikings: Harald Hardrada (a tall figure fighting two handed), a raven banner (landwaster), and a champion with ax to hold Stamford bridge itself.
the Saxons: Harold Godwinson, his personal banner (described as an 'armed man'??)and a Huscarl bodygaurd
the Normans: William the Conqueror (maybe holding helmet to show his men he had not fallen during a critical moment at Hastings), Eustace of Boulogne carrying William's 'Sacred Banner'(a gift from the Pope), and Bishop Odo wielding his club. All Normans would be on horse of course