Possible Clues:

• Moody characters need energy to travel around clubs
• A combination of characters come into play
• :-P, e.g.
• E-mail attachment?
• Graphic way of conveying feeling in e-mails
• Face sideways?
• Smiley in an e-mail, e.g.
• Symbol in email or text message to show joy etc
• :-), e.g.
• :D, e.g