Name: Isaac / Robin
Age: 16-17 (his mom says at the beginning, "You're nearly 17)
Element: Earth (throws rocks and trees around...that stuff)
More: His parents were crushed by a big boulder when he was 14. Then, 3 years later, he went trekking in Sol Sanctum with Kraden, Garet and Jenna. Saturos and Menardi followed them and took all the elemental stars except the mars star, taking Jenna and Kraden with them. Isaac and Garet were set on a quest to stop Saturos and Menardi lighting the lighthouses.

Name: Garet / Gerald
Age: 17
Element: Fire (Yes Garet! Fire! Meesa lurve fire!!)
More: Went through the same stuff as Isaac, I suppose he's the comic relief in Golden Sun, though he is a bit Superman-y.
Quote Garet when they capture the theives in Vault: "Evil will never prevail!"
I'm just suprised he knows a big word like prevail. ;)

Name: Ivan
Age: 15
Element: Wind (Though he gets lightning as well)
More: He was Hammets servant or something. When Isaac and Garet met him in Vault, Hammet had left him behind to get back the Shamans Rod. When the 3 got it back, the mayor told them Hammet had gone to Lunpa. After Ivan found out that He couldn't get in Lunpa, he remembered Isaac's quest and set of to join him.

Name: Mia / Mary
Age: 17
Element: Water (All the states of water, steam, water and ice.)
More: When Isaac, Garet and Ivan met her, she was the healer for people in Imil. She had a special Psyenergy called Ply which she used to heal them. The gang helped her through Mercury Lighthouse and when the lighthouse was lit, the well filled up. It was magical healing water, so the villagers didn't need her anymore. She decided to accompany Isaac on his quest.

Name: Saturos
Age: Haven't a clue, he looks young though.
Element: Fire
More: He came from Prox. Um. Oh yeah, he and Menardi were with some other Proxians and they went to Mt Aleph to get the Elemental stars. Unfortunatly, they set off a trap and a boulder came down. A huge storm came up, Everyone in Vale had rushed down to the plaza. Saturos and Menardi were the only ones out of the Proxians to survive. 3 years later, they came back and this time managed to take 3 Elemental stars. He intends to light all the lighthouses.

Name: Menardi
Age: Don't know
Element: Fire (YAY!)
More: She basically hangs around with Saturos..and she's the bossy one.