You will find out by asking him questions that he is one of the Celestials, him being the Embodiment of the Moon. If you think of "night time" you might think of "bed time". Ilyas has a sleepy expression. His eyes are always closed as if he were asleep. He almost never opens his eyes, but if he does his eyes look bright like white crystals. His skin isn't pale, it's literally white. His hair is long, white with grey streaks. When he talks, it's monotone. He's serious, but maybe also nice...