The nature of Aradama was fully expanded within the second cour. This would also be a clue to justifying each of the three Himes' goals.
Tagitsuhime represents the resentment of Aradama towards humans. A manmade process separated noro from aradama, and as noro turn into these higher beings, they are able to feel this hate towards the humans that pulled them apart from the tamahagane they are supposed to be one with. She has "hands" on her ears—she "hears no evil", but also cannot listen to human reason.
Takirihime represents the twisted compassion aradama has to humanity. She believes that as greater beings, humanity must fall under the rule of aradama. She has a point; after all, noro and tamahagane share a divine origin, and have been regarded as gods (as Aramitama). She has "hands" on her eyes—she "sees no evil", but also cannot view herself with humans on equal terms.
Ichikishimahime represents the desperation to cure the emptiness of Aradama by merging with humans. She was the mastermind of the Myouga Project that gave us the Elite Guards and Ayumu, and we can imply here that Ichikishimahime gave up on wanting to reunite with tamahagane so she went for humans as the next best thing to curb their emptiness. She has "hands" on her mouth—she "speaks no evil", but is not given the chance to speak her mind.