Me wondering why the others have red outer but caleb is the only one that has black outer with red inner combo

based on my interpretation
inner red: signifies passion, vitality, and joy hidden beneath a composed exterior, also may hints at warmth and emotional depth that might not be immediately apparent but revealed over time
black outer coat: adds a layer of mystery and authority, portraying the him as someone with a guarded or enigmatic personality. It could also imply a protective role, shielding their inner fire and emotions.
(possesive yet warm, his warmth and passion can manifest as intense affection or possessiveness, making him someone whose love feels all-consuming. yet he may also struggle to balance this intensity with his other traits and choose to hold back and hide his feelings away)