While I haven't named my mighty Spearmen champion, I nominated him to become not only the Greatswords, but to be the champion of that unit as well.
General of the Empire Spengler and his 3 Wizards were engaging Dark Elves. A unit of War Witches lead by a Hag (Is that the correct name for the unit and Hero choice?) charged the unit of Spearmen holding the left flank. The Hag issued a challenge, which was met by the Spearmen Champion (who was bravely protecting the Wizard in the unit). The Hag, who had already suffered a wound from a Mortar, missed all of her attacks against the Spearmen champ. The champ, in return, hit and wounded with both attacks and no saves were made. The next round of combat, the Spearmen champ challenged the Witch's unit leader and also killed her. With both the hag and the unit champion killed, the witches turned tail and fled, only to be run down by the Spearmen unit.
Every game since that I've played against that DE player, I've fielded that spearmen champ as the champion of the Greatswords. It hasn't worked out that well since, however.