The system would be that when you reach a certain level of affection with a certain character (approximately level 3+) he could send you messages. The messages would serve to make the game more live and you care more about that character.
When reaching the maximum level of affection, the character could send gifts in messages to thank you. Gifts could be: cogs, serums, materials and maybe BCs!
#CHARACTER MESSAGING SYSTEM BASED ON THEIR AFFECTION
brittle cave