Igtenos is dormant most of the time, and you don't get to see him all to much because you don't get Garr until the end of the first have of the game. He becomes dormant when Garr tries to use him to destroy the Eye of Atamoni.
[Personality]
As a human in the Aeth'er Wars, Igtenos was the head of the E'rther Army's Intelligence Unit. In his Swordian form he's still really smart and i have no idea what he's pbabbling about most of the time. Unlike certain other Swordians ::cough::DymlosAtwightClemente::cough:: , Igtenos had a master that had a personality similar to his own.
[The Truth]
Warning! This section explains nearly everything about Igtenos. If you don't want to know, then don't read!
Nothing much except at the end all the Swordians die trying to stop the Eye of Atamoni from blowing up the world. That was a really sad scene ;.;