If ever you need a random-roll for what type of knight a character faces in tournament, or just new ideas, what follows is a great big list (some with further descriptions and nicknames) of different sorts of knights.
Some of the names of locations & faiths are from Midian, but these are easily changed to fit different campaign settings.
These Trolls travel land and sea in an eternal search for their next war. The Host of Battle—for they have no other name for themselves—is part mercenary army, part ethnicity.
Perhaps those that practice elemental magic begin to take on characteristics associated with their chosen element. For instance, an earth elementalist might be prone to agoraphobia, while air and possibly fire elementalists might have problems with claustrophobia. Water elementalists might always seek the path of least resistance. A fire elementalist might have a cat's opinion of water. This could also apply to physical differences. Fire elementalists might have a freakishly high metabolism and a permanently high body temperature. Water elementalists would probably never get dehydrated, but might slow down a lot when it's cold. Etc, etc.