Idia is a tall young man with pale skin and bright blue, fire-like hair. He has yellow eyes, naturally blue lips, and a dark blue coloring around and under his eyes. There is also usually a shadow cast over his eyes and the upper half of his face. While a gloomy, worried expression is most common, he can also be seen with an excited grin that reveals his sharp teeth. Idia’s hair is considerably long and reaches down to his knees. While his long bangs fall loosely around his face and between his eyes, the hair on the top of his head seems to flow upwards. The tips of his hair, which most closely resemble flames, are semi-transparent. On some occasions, the color of Idia’s hair changes to reflect his mood. When he is relaxed, his flaming hair stays a soothing blue, but when he's enraged, it turns a vivid red-orange. Additionally, his hair tips can turn pink whenever he feels embarrassed Idia is a shy and withdrawn person with a dark outlook on life. Despite his little brother’s suggestions, he prefers to stay in his room at all times, and takes classes remotely whenever possible to avoid interacting with other people. He almost never shows up to ceremonies or housewarden meetings in person, instead using a tablet device to speak from his room. When in public, Idia can get anxious rather easily. He has a tendency to stutter when speaking with unfamiliar people, so he is sometimes seen using his tablet to communicate and often uses it in multiple situations as Sebek noted that "He must be HIGHLY peeved if he's speaking without his tablet."[5][6] He also seems to be self-conscious about his looks, and is quick to assume that strangers will stare or make fun of him behind his back. In general, he expects a negative outcome from any social situation, so he would rather avoid them altogether.[7] Despite all of this, Idia acts very differently under certain circumstances. He can talk with people more calmly if he's playing a board game with them[8], or if he's speaking with them over the internet. Moreover, he can speak quickly and enthusiastically about his hobbies or interests, greatly contrasting his usual demeanor. He can also be rather prideful when it comes to his engineering or gaming skills, often considering himself a genius. The Styx Director and father of Idia maintains that his son’s genius was inherited from his mother.[9] When he isn't talking to someone face to face, whether it be through a screen or behind a wall, he can speak clearly and quite bluntly. This sometimes backfires on him, though, as he can get a bit confrontational and say things he doesn't mean in the process. Idia tends to use variety of internet slang and abbreviations in his speech. He also commonly uses video game terms as metaphors for his own experiences.