The Clouds are a trio of living clouds that hang out and possibly live with Kieran Valentine. They met him less than four centuries ago and help him with his heart collection. The trio debuted in "Why Do Ghouls Fall in Love?", in which they are voiced by Cam Clarke.
The Clouds are perhaps even more cruel than Valentine, taking sadistic glee out of the way he plays his victims and leaves genuine love interests with shattered hearts of their own. They're not above turning on Valentine either if he loses control of the situation. It's not clear why they hang out with him, but given that they turned their malice on him the moment he lost control and power, it might be that's what interested them.
- The credits of "Why Do Ghouls Fall In Love?" call them "fop Clouds".