Dramatis Personae - Background example (I'll use mine here)
Name- Sir William de Tancarville
Allegiance - England
Weapons/armour- Rides a destrier, as do most knights. Wears a full linked hauberk, once worn by his father; he has added steel bracers with gold chasing and the lion passant, symbol of his family's arms, with matching spaulders and greaves with attached poleyns, relatively new among the lower landed gentry. His great helm closely resembles the transitional helm once worn by his greatest grandsire, William I on Crusade, complete with the cross cutout on the right cheekplate, no lace, no frills. Has a large heater shield strapped over/behind his right shoulder, which matches his tunic and carries the lion passant emblem of his family; and a well balanced single hand cavalry sword with a long, lean blade with the inscription 'NINOMINEDOMINI' inlaid in iron in the fuller of the blade, on his right hip(type Xa handed down from generation to generation, wielded by his 4 times removed grandsire, William I de Tancarville, in the Third Crusades serving under King Richard Coeur de Lion) with matching brown scabbard and belts patterned after the original, Crusades-era scabbard that has since fallen apart. Carries a utilitarian, guard-less short sword in a scabbard riding sideways at the small of his back (a gift from his Irish wife who'd found it amongst her father, the former Earl's possessions), (partially hidden by the cantled saddle) as well as his longsword's mate- a dagger with a custom made matching brown scabbard that sits on his left hip, angled toward the front for rapid deployment in the off-hand. Wears a yellow and green silk parti-colored tunic over his armour displaying his familial crest of the red lion passant. His horse, a fiery chestnut destrier with white fetlocks, is outfitted in kind, with matching colors.
Retinue - William has taken 50 of his greatest knights to accompany him to battle; all are caparisoned identically to the Lord de Tancarville, with the only difference being the lack of obvious finish to their weapons and armor, being knights of his mesnie.
Appearance - He was named for his grandsires, the first of whom was named after William the Conqueror, perhaps the greatest William of them all? He is tall for the era, of a darker hue but well built, and comely to a courtly maiden's discerning eye. Clean shaven, keeps his hair shorn in a show of piety, much like his Norman ancestors. Prides himself on his knightly attributes, namely his horsemanship, superior skill in arms as well as his adherence to the chivalric code.
Personality- humble, as it should be for a knight of the lower gentry, albeit landed; takes great pride (and pain) in being compared to his storied ancestor; is known in his territories as a stern, but fair lord who values his people as more than just chattel to produce for his needs alone. Quick to anger, but will listen to reason, given enough time to calm and be willing to. Well-loved and respected by the people of his lands, as well as his family. As he nears his 30th winter, his men have noticed a more stable aspect to his demeanor, much to their hidden delight. Maybe he will sire children, grow old, retire? Maybe drills won't be so hard-fought as they were used to? Mayhap one day, he would say, with a glint in his eye.
Additional Info- Tancarville arrives to support his King, even if his policies do not gibe with Tancarville's noble sensibilities. After all, Edward II was nothing like his sire, Edward Longshanks, who had wreaked untold havoc amongst the Scots only a few years before.
Secretly, he empathizes with the Scots, but is bound by the oaths he and his household swore to the King; as such he realizes he must be present, but will not be party to the outrages some of his lesser minded contemporaries, such as that farce, Prima Nacht.
Here's one of the opposition:
Allegiance: Scots
Name: William McFarlane
Weapons/armour: The generic kilt, red and green patterning, bare chest with family mementos hanging from a chain, including a carved bone mountain he cherishes. He carries a monolithic axe and a heavy Kite shield.
Retinue: 100 strong men, all from his village. Every one a brother, a friend, a mate. All equipped with light shields, and either axes or broadswords.
Appearance: Quite tall, 5'8" or so. Long sandy brown hair and very muscley, broad appearance. Wears sandals. Green eyes.
Personality: Respects his country and is very patriotic. Will fight for his village and friends to the very end. Has a family at home waiting for his return.
Additional Info: Has a tendency to drink...a lot.
So you see, you can keep it plain and/or simple, or somewhat more, its up to the player.