This is a list of characters from the games Golden Sun and Golden Sun: The Lost Age. Names are ordered by their U.S./Japanese/French counterparts, if they have them.

Wise One

The Wise One is the protector of Vale, Isaac's hometown, and Sol Sanctum. He asks Isaac and Garet to chase Saturos and Menardi and get the Elemental Stars before they manage to light the ligthouses. In The Lost Age, they learn that the world will be destroyed unless the lighthouses are lit, but the Wise One still refuses to let them do it. Technically, he cannot interfere with Felix and company's quest to light the lighthouses, but he uses the pretense of a "miracle," and brings a 3-headed dragon known as the Doom Dragon to attempt to stop them. This prompts the party to fight the Doom Dragon, and they beat it in battle. Once the Doom Dragon is defeated, it is revealed that the Doom Dragon was actually a fusion of Isaac's father, and Jenna and Felix's parents. This leads some of the party to curse The Wise One, calling him cruel. Isaac however, remains stoic and reveals that he knew what the Doom Dragon was the moment he raised his sword, but was willing to sacrifice them for the greater good. Kraden is also aware of what the Doom Dragon is before the party fights it, as shown when he tries to stop them before the fight. The party thinks some more and realizes that The Wise One might have called upon the dragon to give Felix, Jenna, and Isacc their parents back. They agree The Wise One's wisdom is unfathomable to them.

Alex

Alex is a Mercury Adept from the northern town of Imil. He was originally Mia's apprentice, but he rejected the life of a healer and set off to learn the secrets of Alchemy. His only objective is to reach Mt. Aleph when the lighthouses are lit, which will turn him into the most powerful being ever, but at the end his plans are stopped by The Wise One, and Alex supposedly gets crushed under Mt. Aleph. In the Japanese version of the game, he is indicated as the apprentice of Mia's father, which makes more sense given that he appears physically older than Mia in the game. Alex exhibits powers not adherent to Mercury adepts, such as teleportation. It is presumed that he acquired these extra powers through his training to learn the secrets of Alchemy. Alex's intentions are cloudy throughout the games, up until the end of The Lost Age. He seems to be a double-agent, but it is later revealed that he has helped anyone that could be able to light the Lighthouses, thus inching him closer to his ultimate goal of harnessing the Golden Sun's power.

Felix/Garcia/Pavel

Felix is an 18 year old Venus Adept from the town of Vale. Jenna is his sister.

In Golden Sun's prologue, Felix is swept away by a river and presumed dead. However, he is actually rescued by Saturos and Menardi further downstream, whom he later assists in the theft of the Elemental Stars. He shows a kindness that neither Saturos or Menardi have, and makes sure that Sheba, Kraden, and Jenna are protected. He even shows that he is willing to fight Saturos and Menardi to keep them safe. Due to this loyalty and chivalrous attitude, Saturos and Menardi do not trust Felix. At the end of the first Golden Sun, Felix dives into the sea from the top of the Venus Lighthouse to attempt to save Sheba when she falls into the Great Eastern Sea. He, Sheba, Kraden, and Jenna all end up on a piece of land floating east from the Venus Lighthouse at the end of the first Golden Sun.

In Golden Sun: The Lost Age, Felix becomes the main character. He becomes the Isaac of The Lost Age, he doesn't talk anymore, but the game allows you to sometimes answer yes or no questions, as with Isaac in the first Golden Sun. Felix carries on Saturos and Menardi's plans to light the Lighthouses because he realizes what will happen to Prox, along with the rest of Weyard, if he doesn't light the beacons. He does this, even knowing that eventually he might have to fight Isaac and the rest of the party from the first Golden Sun.

Garet/Gerald

Garet is a 17-year-old Mars Adept from Vale. He is part of the playable party in both games, though he is more active in the first. Although a strong, capable fighter, he is not exactly bright, and is often used for comic relief.

Isaac/Robin/Vlad

Isaac is a 17-year-old Venus Adept from Vale, and the main character in the first Golden Sun. After Sol Sanctum is attacked by Saturos and Menardi, Isaac and Garet are given the task of finding them and retrieving the Elemental Stars.

Ivan

Ivan is a 15-year-old Jupiter Adept who grew up in Kalay, though he was born in Contigo. He joins Isaac and Garet after they help him retrieve the Shaman's Rod from bandits in Vault.

Jenna/Jasmine/Lina

Jenna is a 17-year-old Mars Adept from Vale. Felix is her brother. She is a playable character in Golden Sun, but is only in the party for a short time, since she is kidnapped by Saturos and Menardi. In The Lost Age, she becomes a permanent party member.

Karst/Karstine

Karst is a powerful Mars Adept from the far northern wastes of Prox. She is Menardi's sister and vowed to kill Isaac to avenge her. She uses a sharp scythe in battle, just like her sister.

Agatio

Agatio is a powerful Mars Adept from the far northern wastes of Prox who joined Karst in Karst's quest to light the lighthouses and, at the same time, avenge Karst's sister Menardi by killing Isaac.

Kraden/Sclater/Thelos

Kraden is an NPC who travels with the party in The Lost Age, as well as part of Golden Sun. Although he is not an Adept, he has devoted his life to the study of Alchemy and Psyenergy. He moved to Vale, hoping to learn the secrets of Sol Sanctum. He is quite enthusiastic, but a coward when it comes down to it, as shown in Sol Sanctum. Many players find him more irritating than helpful because of his long talks about the history of alchemy.

Mia/Mary/Sofia

Mia is a 17-year-old Mercury Adept from Imil. She is the guardian of Mercury Lighthouse and a healer for the people of Imil.

When her former fellow apprentice, Alex, helps Saturos and Menardi enter the lighthouse, she joins up with Isaac in order to stop them. Although they are too late in reaching the aerie, the lighting of the beacon produces a supply of Hermes' Water, a healing potion, thereby, reducing the villagers' dependency on Mia. Her obligations removed, she joins Isaac's party in their quest.

Piers/Picard

Piers is a Mercury Adept from Lemuria, and a party member in Golden Sun: The Lost Age. Being a Lemurian, it is impossible to tell how old he is, and he refuses to tell his companions when Sheba asks rather rudely. Piers was sailing his ship around Lemuria when a Tidal Wave struck and brought him to the mainland, there he was jailed falsely for being a member of a pirate raiding group. Felix and his party join him to help recover the orb needed to steer his ship, he remains with them to help light the remaining lighthouses.

Babi

Babi is the ruler of Tolbi, a very active city, especially because of the annual Colosso battles. He is rumored to be 150 years old, thanks to a magic draught he found in the lost land of Lemuria. Since he's running out of draught, he asks Isaac and his friends to find Lemuria and bring him more draught before it's too late. In The Lost Age, before Felix and his companions get to reach Lemuria, Alex informs them that Babi is dead.

Sheba/Shiba/Cylia

Sheba is a 14 year old Jupiter Adept whose birthplace is unknown. (Supposedly she fell from the sky.) She is a protagonist in Golden Sun: The Lost Age. In Golden Sun: The Lost Age she is tasked with lighting the Lighthouses. After the Jupiter Lighthouse is lit, Sheba reveals that she was also searching for information about her identity, a search which had proven unsuccessful.

Saturos and Menardi/Satyuros and Menadi/Salamandar and Phoenixia

Saturos and Menardi are powerful Mars Adepts from the far northern wastes of Prox. They are the main antagonists of Golden Sun.

At the beginning of the game, they are the only two survivors of a failed raid on Sol Sanctum. Three years later, they try again with help from Alex and Felix. This time, they succeed in obtaining three Elemental Stars, but they are forced to flee without the Mars Star. They succeed in lighting Mercury Lighthouse, but at Venus Lighthouse they are challenged by Isaac and Co. Although they are defeated in battle, they manage to light the beacon, and its power surges through them, causing them to merge into the Fusion Dragon. Isaac and Co. defeats this as well, and Saturos and Menardi fall into the beacon and are killed.