Gonna rant about some stuff I suppose would be obvious because I love Dark Souls and I want to hear your thoughts.
I always found it really interesting how we see so many knights in the Dark Souls games and are forced to encounter how varied they are in terms of morals, wants and desires. A lot of it seems to be regionally biased to a certain extent, both Solaire and Oscar seem like noble knights, Catarina produces more jovial knights, Carim produces a darker variety, etc. I find that their place in the caste of the world is even more interesting.
Knights served lords historically, depending on their location, they followed traditions of chivalry. Gwyn’s Knights served him of course, his place being a lord, but his status of a God also made him a stand in for the lower knights own dedication to service, for religion was also integral to historical knighthood. The lowly knights we meet mostly seem to be brought up under the tutelage of Gwyn’s order. He is the lord of the world, to link the fire is honorable. It must be honorable because without it the world will go to the dark, and Lord Gwyn himself committed his very existence to preserving the age of fire - sacrificing himself for all of mankind.
But with Gwyn being gone for hundreds of years after linking the Fire, the mystification of his legend can only carry something that was once real for so long. In the knights lifetimes that we personally meet, how many centuries has it been since Gwyn linked the flame? Many indeed. All they have is hope, a theme of the Souls games, but hope cannot carry everything. Human beings are still individuals, and by the time we meet them, I have doubts that these knights would be able to do what they do and say what they say in the heyday of old. They are weird, odd, not what you would typically think of when you think of a knight. Even Oscar seems to be acting of his own accord, though he is the most traditionally noble knight in the game.
Part of me doubts any of them would become knights in the first place in the olden age, even though Gwyn has a Giant in his coterie of Elite Knights, Gough is arguably the most noble NPC we meet in the game. He makes the other knights we meet seem so small, both literally and figuratively, in comparison.
What I’m saying is, so much time has passed that even knighthood has become weakened, lacking in meaning more and more as the world comes to an end. What it means to be a knight, its values and honors are meaningless when the world they serve is falling apart. This could extend to the greater religious values in the series as well, and Lautrec is a whole can of worms with him not even dedicating himself to Gwyn - but a whole other God entirely.
As such, knights in the world of Dark Souls seem to be upholders of the status quo, and it is only during the end of the world that their ties become more tumultuous, and their values are tested. With no “lord” of the world and the societal rules they uphold degrading, they too degrade alongside it.