Kaeya's surface personality is one of humor and lighthearted flirting, when in reality, it's a veil to conceal a deeper sadness within himself. He'll almost never admit that though, even if it's a little obvious. Deep down, he's a kind and caring individual who's been through some horrible trauma in the years past. Initially he may be a little distant with his roommate, but that's sure to change with his upfront and outgoing nature.