A dedicated post? Wooohooo!!! Thank you, Hadrien!!
Ahem... I would like to start off by saying this: what I know comes from watching other people play, for I only tried the first game, and got stuck on my way to...Quelaag. I know.
I find it kind of funny, to imagine my hypothetical build would change drastically, if I was actually in that universe. In the human world, I would go in safety mode, with the longest spear and most protective armour. But, in Dark Souls, I would absolutely love to learn frost magic, like Priscilla's breath.
Hehehe. There is a certain serenity in your character, sitting down, watching the other players run around, to then decide that play-time was over.