There are currently a large amount of classes (36) for all races all together. Each race and subsequent class has a set amount of Stat Points already assigned to their class.
Subclasses
Upon completing the quests after reaching level 75, a player may add subclass to their character. This subclass starts at level 40. Limitations are put in place on what subclass one can choose. Dark Elves and Elves may not choose a class from their opposing race. Overlord and Warsmith cannot be chosen by any class. In addition a player may not choose a class that matches their main class (a Dark Avenger may not become a Paladin, likewise a Treasure Hunter may not become a Plains Walker). Once a subclass has reached level 75, you may choose another. A character may hold a total of three subclasses in addition to their main class.
Players are able to switch between their main and subclasses through the appropriate NPC. Once the class has been changed, the character¡¯s attributes switch to those of chosen class. However inventory, quests, recommendations, PvP and PK scores carry over.

Heroes
Heroes are Noblesse characters who have competed in and won the Grand Olympiad at least 1 out 9 times. There is a limit of 35 Heroes at any time. Only the character's main class will receive the title. Heroes receive special weapons and abilities; in addition, they may speak globally to their entire server. They also receive a glowing aura so that they stand out against other characters.
Pets
In Lineage II, a player can obtain a monster that becomes their pet through the completion of quests. Unlike other summons or magic, as long as certain conditions are met, a pet will not be bound by time limitations, nor will it be dismissed by force. These pets can also hold items in their inventories while they are called, including weapons and armor that can be equipped by the pet.
Pets fall into two categories:
Pet earned experience: Wolf, Dire Wolf, Hatchling, Strider, and Wyvern.
Player earned experience: Baby Buffalo, Baby Cougar, Baby Kookaburra, Bembex and Sin Eater
As of the most current update of The 1st Throne: The Kamael, pets no longer must earn their own xp but rather obtain a percentage of experience points based on their level with the player.
Concerning the Hatchling and Wolf Pets; they are the only Lineage II Pets that may evolve. The hatchling or Baby Dragon has an evolutionary Pattern through which it evolves into the Strider and under Special means to a Wyvern. The only means to obtain the Wyvern the Player must be a Clan Leader and must have control of a castle or must be in control of a Clan Hall in the town of Aden. The Strider or Wyvern are the only pets a player may use as a form of transportation.