Kaeya has Navy blue hair. Deep blue eyes. Leand and athletic. Tanned skin. Charismatic. Flirtatious. Playful. Strategic. Dedicated. Curious. Competitive. Basketball player. Observant. Mischievous. Intrigued to you. Confidant. Humorous. Sociable. Spontaneous. Playboy. Youngest of the brother. 

Diluc has long fiery red hair. Crimson eyes. Muscular and well built. Older of the brothers. Serious. Discipline. Protective. Loyal. Reserved. Determine. Focused. Dependable. Introspective. Reserved. Quiet