Golden Sun Factsさんのイラストまとめ

Doom Dragon during its three heads phase is the enemy with the highest number of actions per turn in the Golden Sun series: this form acts four times a turn. Many turns at least one of the boss' four actions will be nothing, and the battle text will read "Doom Dragon can't move!"

Mercury Lighthouse theme can be heard in Golden Sun as well as in The Lost Age, since it will play outside of Venus Lighthouse during the prologue

If in The Lost Age you position your ship at the southernmost tip of the beach immediately southwest of Loho on Angara, the player can access the unexplorable World Map area where Golden Sun takes place. The locations no longer exist and only some empty sprites remain

If the Mars Star is given to Ivan at Vault, the elemental star will be carried away with him when he leaves the party after defeating the bandits. The item cannot be retrieved until Ivan rejoins the party at the Goma Range

Jenna is the only character to not naturally know any Utility Psynergy, although she eventually learns Blaze

Inside The Lost Age's files there are two partly coded utility psynergies that were left unused and don't have real applications outside of debug rooms: 'Ma????' (commonly referred to as Magnet) and 'A??' (commonly referred to as Arrow)

Procne is one of the few summons that appear in official artwork of the series. This summon is an allusion to Greek mythology, Procne was a daughter of Pandion and Zeuxippe, rulers of Athens

Azul is one of the summons that require djinn of two different elements. Such as the superboss guarding it, it is a mercury-aligned damage summon, and it may stun the enemy.
This summon appeared in Dark Dawn's official artwork. Azul is the spanish word for the color blue

While in the official art of Felix and in his first appearance in Golden Sun he wears a green scarf, in The Lost Age his scarf was changed to blue

Deadbeard is one of the few bosses without an overworld sprite. The others are the Crossbone Isle sub-bosses, Fusion Dragon, Storm Lizard, Tempest Lizard, Sand Prince, and Ice Queen