[@Silent Observer] to some extent. Remember these demons have know each other a long time. Some will be friends. Some wont. The Demon in the character could fight the affects of other demons. Some will allow their human affected. Others wont. Griffin's fear would be small places. 

[@XxLyraxX] sorry I feel asleep

[@AudioVision] All the demons 'feed' on something. Secrets would know everyone one secrets within say a mile. When Secrets gets bored of those secrets I would have to seek more. Promiscuity is the same. The character would have to sex and sexual stuff. Being with someone once would energize the person but the second time not as much. 

[@decayedAngel] Pain craves pain. He cant cause illness or disease.