They be robot like things, that's close enough to make them cold. Besides, Nolandroid's take was chock full of emotion and look what travesty that birthed.

Robots ? We don't know that yet. It just says born from the travelers light. It could be a reincarnation of our characters best friend for all we know. He does say I don't want to lose you again

Still, it doesn't make sense for the Ghost to be the cheerful campy one. He's been in the world much longer than the guardian, atleast in its current state. The Guardian, and by extension the player, should be the one full of wonder in the foreign world he or she woke up in, while the Ghost has been hardend by it. Basically the game plays the ghost as the wide eyed kid and the guardian as the stoic straight man. Those roles should be reversed.