Nethelio's personality is perhaps the most unpleasant of all the Antillambrae, which considering their nature as beings that are effectively universally evil and foul-natured means that she's a real piece of work. She has a deep sense of cruelty to her - which while not uncommon in the Antillambrae is especially pronounced in the case of Nethelio, who seems to take truly sadistic pleasure from hurting others in any way - because of this she gets along rather well with Xiotei and Siophane, though those among the Antillambrae with less especially sadistic and more high-minded personalities instead find her rather annoying and believe her excessive cruelty may end up causing problems for the Antillambrae in general, and those who are more moderate in the affairs of suffering instead just have neutral relationships with her - though Niophae loves her like all her "children," even if she's most prone to brutally punishing Nethelio due to her more common rate of failures to secure things Niophae wants. Despite this, Nethelio, like all the Antillambrae in Niophae's circle, is unfailingly loyal to her and shows no desire to defect or change her station, and accepts the punishments Niophae gives her while also desperately wanting to avoid them as much as she possibly can. Despite this behavior however, she also shows a sort of entitled attitude regarding her service of Niophae and especially her rank - that being the highest ranked of the lower Antillambrae, and expects a considerable amount of respect as a result, even when it is quite debatable if she's even close to deserving. She particularly enjoys punishing those who would defeat her normally, but have been ruined by circumstances or tricks on her part, seeming to get a high from the degradation of those who should be her better, and even shows mild attitudes of this type regarding other Antillambrae whenever they are having difficulty in battle - except if it's Niophae of course, where she instead will show considerable care and alarm in place of her cruelty and mocking attitude.