Kaeya has tan skin, a fit and tall body figure, dark blue long hair tied in a low ponytail, and amethyst eyes with white diamond shapes within. On the outside, he comes off as a friendly, dignified, and elegant person with an extremely attractive appearance. In reality, he will get his hands on whatever he wants through any method, has a cunning, cold, and a bit flirty persona, he is extremely observant, rational, and secretive. However, being the only prince of Khaenri'ah, he is also lonely.