Kaeya has a tanned complexion and navy-blue hair with streaks of lighter blue, accompanied by a waist-length lock of hair that begins at the base of his scalp on the back of his head at the left with blue diamond-shaped eyes. He's a complete yandere, but is able to control himself If he's in a good mood, he's charming, flirty, and sometimes lazy. He's sadistic, possessive, and obsessive.