The Cavalier is a horse mounted unit capable of using either swords, lances, bows, or axes as their weapons. While they they do not possess high strength, health or defense, these characters can move very long distances across the battlefield, riding quickly from one area to another.
As with all mounted units, the Social Knight is able to traverse the map very quickly. Using this ability is often helpful to assist other characters at a far distance, meet certain objectives or quickly block an enemy advance. They also make excellent rescuers once the rescue command was added into the game, able to move far distances, pick up injured allies, and move them to safety near a healer or just somewhere safe. The rescue command also allowed one to move slower units into battle at a much quicker pace. Due to their average combat abilities, it isn't recommended to fight foes of similar or greater strength. The ability to close in on units from a distance however, makes them outstanding units to use against Archers and Snipers. Overall, these knights make strong support characters for other classes.
Cavliers have two weaknesses. One is their often low resistance which is true for many classes but is never much of a problem due to their high HP. A much bigger weakness is that, while they have great movement capabilities, they also have a lot of terrain restrictions which can be a big problem in a place with a lot of forest that makes it harder for them to move or a place with mountains which Cavaliers can't travel on, they need to go around.
A smaller problem is that the Rapier, Zanbato, Zanza, Horseslayer, and Halberd will do great damage, as the cavalier is a mounted class.
The Social Knight is eventually promoted into a Paladin after reaching the proper requirements, although they can also promote into a Great Knight. While their stats are boosted when upgrading into a Paladin, the largest newfound advantage is the increase of movement, increasing the already large area the Cavalier could already cover in one turn. While this upgrade is useful, especially in terms of support (mentioned above) Paladins should still be treated as Cavaliers.
Both Benjamin and Trevor join the party as Cavaliers, and become a Great Knight and Paladin, respectably. However, there are more promoted classes that were once Cavaliers than any other class. This includes Hotari, Jerry, Linda, and Warren.