Isaac's Party

In the first Golden Sun game you play as the protagonist Isaac. Along with your companions Ivan, Mia, and Garet you leave on a quest to save the world from the threat Alchemy being unleashed upon the world by the lighting of 4 elemental lighthouses. With the powerful magic of the elements on their side these heroes embark on their journey to fight off the destruction of their world.

Party members

Isaac

Garet

Mia

Ivan

Theory About Isaac's group being the real Vilains.

https://gamefaqs.gamespot.com/boards/561356-golden-sun-the-lost-age/48012636