Count Eudes / Odo II of Blois in 1018 might be interesting to play. He was quite quarrelsome; he fought everybody; neighbors, his liege, the emperor. He invaded County of Champagne and became the first member of the house of Blois to hold both Blois and Champagne. Through his mother he was the grandson of the King of Burgundy, so he tried to make himself king there, but failed. He was offered the crown of Lombardy, but defeated. Maybe you can give him a crown which he desired so much.
Another interesting character might be Count Edgar of Oxford in 1066. He was the last member of the royal house of Wessex; he should have been the king of England but we all know what happened there.