Terra

Majority of information taken from Kingdom Hearts Wiki-Terra.

Terra is one of the main protagonists in Kingdom Hearts Birth by Sleep. Terra, along with his best friends Ventus and Aqua, is a Keyblade apprentice, and it is his dream to reach the rank of Master.

His name means "Earth" in Latin, similar to Riku's name in Japanese meaning "Land". Terra chooses Riku as his successor, making Riku destined to wield the Keyblade in the future.

Kingdom Hearts Birth by Sleep
Terra spends his days as a Keyblade apprentice training under Master Eraqus at the Land of Departure along with his friend, Aqua. Terra's long-time dream was to be a Keyblade master like his master.

Four years ago, Master Xehanort visited the Land of Departure, and brought with him Ventus, a young boy that Xehanort asked Eraqus to take care of and train to be a Keyblade warrior. Terra greeted Ven and asked who he was and why he wanted to be a master, however, Terra was terrified to see Ven cry in raging tears, then fall to the floor. Terra felt a great amount of guilt, believing that it was his fault that Ven became comatose.

After a few days, Ven woke up from the coma. Wanting to make it up to Ven, Terra befriended him and became his older adoptive brother. After a long day of training, Terra told Ven and Aqua about his dream of being a Keyblade master, which was also Aqua's dream. Terra smiled, and gave Ven his wooden sword, saying that he, Ven, and Aqua, all carry the same dream. Terra had been Ven's "older brother" ever since.

The three spend time together whenever possible, realizing each others dreams and even distributing good luck charms that would always keep them connected.

5 Years later, he takes the Mark of Mastery Exam alongside Aqua in order to become a master, but is unable to become one, as he is unable to control his darkness. Unbeknown to them, Master Xehanort is responsible for the appearance of such darkness during the Exam.

Terra was even more surprised to find out that he held darkness in his heart, which cost him a chance to be a Keyblade master. Later that day, he was approached by Master Xehanort, who told him that despite the darkness being in his heart, it didn't mean that it would be a problem. Instead Master Xehanort tells him that darkness cannot be destroyed as Master Eraqus said, but it can only be channeled.

Minutes later, Terra is sent on the quest to find a missing Master Xehanort and stop the threat of mysterious creatures called the Unversed with a promise that Master Eraqus may reconsider him as a Keyblade Master. Aqua is later consulted and told to watch over Terra, as he may be tempted by the darkness.

While on his journey, the darkness in Terra's heart catches the attention of the evil denizens of the worlds he visits. One is Maleficent, the evil witch taking control over Terra through his darkness and causing him to steal a sleeping Briar Rose's heart. This action, as well as the many others the dark residents of the other worlds would request of him, would haunt Terra for the rest of his journey, even if his reward was more information on Master Xehanort's whereabouts.

Terra's quest through the worlds eventually brings him to the Radiant Garden, where he witnesses Master Xehanort heading in an unknown direction, Terra assuming there may be some new information for him. As Terra treks through the world, a battle with a massive Unversed leads him to reunite with Aqua and Ventus. Terra soon discovering that Ven had encountered the enigmatic Vanitas, he urges the boy to go home, as urgent duties Terra needs to fulfill will make the situation unsafe.

Aqua thinking these duties are not as Master Eraqus had assigned them, Terra quickly tells her that his goal is still to destroy the darkness, to which Aqua counters by stating the fact that Terra seems to embrace it. Ventus quickly comes to Terra's defense, Terra angered when he discovers Master Eraqus had asked Aqua to spy on him, thus learning of his master's mistrust. Leaving his friends behind despite their pleas and Aqua's attempts to persuade Terra he is wrong about Master Eraqus, Terra soon comes to believe that he can only rely on Master Xehanort.

Terra soon locates Master Xehanort in the underground catacombs below Ansem's castle due to Braig, the elderly Keyblade Master seemingly having been captured by the man. Braig battles Terra in an attempt to obtain the Keyblade, nearly victorious, until Master Xehanort shouts to Terra that in order to be victorious, he'll have to use the Keyblade, itself. Terra challenges his words as the Keyblade's use hosts a potential threat to Master Xehanort, forced to concur when the elderly man makes mention of the shame Terra's defeat will bring Master Eraqus, Aqua, and Ventus.

After the battle, Terra gains the upper hand by using his anger as a weapon, thus losing control of his darkness, scarring Braig's cheek as well as ridding the man of his eye. Braig fleeing as he reels in pain, a freed Master Xehanort soon approaches Terra, who is shocked to find he has been controlled by the darkness yet again. Master Xehanort attempts to have Terra see things in a different light, that he has controlled the darkness rather than vice versa, Terra refusing and stating that now he has no home to return to at the end of his journey.

Master Xehanort then proceeds to offer Terra a position as his pupil, causing him to doubt Master Eraqus. Master Xehanort then explains how darkness is always born within the light, revealing that fear is why Master Eraqus failed to pass Terra in his Mark of Mastery Exam. Master Xehanort then begs Terra to join him in bringing balance to the worlds, stating their mission is to defeat the darkness that upsets the balance, Vanitas. Master Xehanort then pulls the final string, acknowledging Terra's long-time wish and calling him "Master Terra". It is because of this that Terra comes to know Master Xehanort as his new master. As Terra prepares to leave the Radiant Garden, Ventus catches up with him, asking to come along on Terra's journey, to which he refuses. Terra does say, however, that he knows Ventus will be there when he is really needed.

Some time later, Terra finds himself encountering a warm light which calls him to another world. Discovering Paopu Fruit growing on the island, he recalls his friends and the distribution of the good luck charms at the beginning of his quest, Terra wondering why he is there and if he'll ever see Aqua and Ven again. Soon laying eyes upon a young Sora and Riku, he discovers Riku's potential and holds a conversation with the boy. Terra asks why he wants to go to other worlds, later choosing Riku to be his successor when he is able to hold the Keyblade. Riku stating countless times he has cherished things to guard, Terra then makes note that he still has things to protect, as well.

Called soon after to the Keyblade Graveyard by Master Xehanort, Terra learns from the man that Ventus has learned the truth about his past, has gone back to see Master Eraqus about it, and now has a high chance of being eliminated. Terra's goal to protect Ventus, he leaves without question and returns to the Land of Departure. He battles his master, no longer caring about him, using his darkness to win the battle and save Ventus by throwing the boy into a portal to another world. Master Eraqus then dies in Terra's arms from an ambush made by Master Xehanort, Terra suddenly realizing what he has done and beginning to mourn for his master. He then witnesses his home get destroyed as it falls into darkness courtesy of Master Xehanort.

Eventually, the time for the final battle with Master Xehanort and Vanitas had come. Refusing to join up with Master Xehanort and discovering what has become of Ventus's heart, Terra is soon told as Vanitas goes after Ventus and Aqua that he can't save his friends, Terra's great rage and anger towards Master Xehanort staining his heart in the darkness. Terra battles the elderly man, who makes note of the χ-blade's creation before unlocking his heart and possessing Terra's body, thus forming the entity known as "Terra-Xehanort" (portmanateaux by fans as "Terranort"). Terra-Xehanort walking away from Terra's discarded armor, which had been used by the young man in an attempt to shield himself from Master Xehanort's heart, he soon finds himself trapped by the armor, which has reassembled due to Terra's mind. The animated armor fights and defeats the possessed Terra, kneeling as the man is sent to the Radiant Garden and Kingdom Hearts vanishes above it.

Aqua's quest to find Terra after learning from Yen Sid that his heart has been lost, she soon finds him in the Radiant Garden. Surprised when the man attacks her, she soon discovers Terra to be no more, her old friend now a younger incarnation of their old enemy Master Xehanort. Battling the possessed Terra before her in an attempt to return his heart, the dark and confused being that had once been her dear friend proceeds to summon Master Xehanort's Keyblade and a dark symbiote. During the fight, Terra-Xehanort is stopped when Terra's heart begins to fight back against Master Xehanort's from within his body, Master Xehanort's stronger influences causing Terra-Xehanort to unlock his heart in an attempt to finish Terra off. The Guardian then reappears behind Terra-Xehanort, it and the young Keyblade wielder fall into the Realm of Darkness. Aqua gives chase and sacrifices both her Keyblade and armor to save her old friend's body. Terra-Xehanort is brought back to the Radiant Garden, but this time without any memories besides a name: "Xehanort".

Sometime later, Terra's heart is seen with Master Xehanort's inside the new Xehanort's body, the two disputing over who will control it. Terra, with the heart of Master Eraqus sealed within him, concludes that no matter what, he will do all in his power to hold Master Xehanort at bay, no matter how sure the elderly Keyblade Master was that his evil plans would succeed.

Kingdom Hearts II
Terra does not make a physical appearance in the game, but is mentioned in The World That Never Was when Sora encounters Xigbar, who mentions "other Keyblade bearers", referring to Terra, Aqua, and Ventus. An armored Terra, Aqua, and Ventus also appear in the secret ending of the game, titled The Gathering, before their final battle with Master Xehanort and Vanitas. In the Final Mix version of the game, the Lingering Sentiment serves as an optional boss, and the secret ending, titled Birth by Sleep, shows portions of the final battle between Terra, Ventus, Aqua, Master Xehanort, and Vanitas, albeit with some minor differences.

Blank Points
Terra is seen at the Land of Departure with a sleeping Ventus, waking his friend up before they both utter Sora's name with a sense of renewed hope.