In each quest of the hidden hand, the traveler appears to us an interactable. Always wearing the same hat regardless of the form. And all encounters are basically at or very near the entrance of each quest.
Army of Eternal Night - Wandering Elf
Order in the Court - Normal Statue
Three Paths to Battle - Odd Lantern Archon
Growing Pains - Totally Normal Cow *
Side note very worth talking to the cow multiple times. very funny
The Hand and the Eyes - Wanderer
However, it the odd Lantern Archon that seals the deal for me.
The Traveler, an estranged member of the Dark Six, not that it is really related to them or even the Sovereign Host.
From the
wiki:
The most mysterious of all the gods, the Traveler is believed to be a supreme shapeshifter and trickster, a virtuoso of deceit and craftiness, a creator of things and a bringer of knowledge.[1][2][6][3][8] It is even believed to be the true lord of Eberron, having walked all its roads and seen all its sights, and left them all transformed.[5] However, it is also said to be impulsive and unpredictable[16] and a creature of dark cunning.[5] The Traveler is thought to look favorably on those who use their wits or are resourceful, and to disapprove of those who beg for safety and care or for unearned gifts.[6]
Bolded for emphasis in where the Traveler sits in regards to others in Eberron and would be invaders.