Race: Nord- Male, of course. By Canon I picture the guy that blesses every picture of Skyrim advertising, with the horned helm on (look, it's the background of THIS website).
Style: Heavy Armor, Shield & Sword Warrior... true Nords like Iron & Steel.... and leave fancy elven stuff for the elves... I know Nords get a racial bonus towards 2H, and I might still go that route, but was looking forward to maximizing the Block tree.... I could be talked out of this I think... but would kind of model him after Boromir of LotR, which being a "Horse Lord", if Boromir was in Skyrim I think he would be a Nord...
Guilds: Companions, of course... will probably stay Werewolf... so Dawnguard later in the game...
Civil War: Stormcloaks... true Son of Skyrim (yes I know they are racist, but I think Canon wise the MP would be a Stormcloak supporter, which brings me to...
Crafting: Absolutely NO magic/alchemy/enchanting.... Nords dislike this, and I think avoiding any Alchemy/Enchanting and only Smithing the game will have a nice challenge (I only play on hardest difficulty).
My plan, is after escaping Helgen going right to Whiterun, and joining Companions... and following that questline all the way through before progressing MQ at all (unless required to progress), then MQ to a point undecided while balancing MQ, and mixing in Dawnguard at some point...
And blogging the whole experience because I'm crazy like that...
So, what would you do different on your Canon playthrough?