The Question and Answer section for A Christmas Carol is a great resource to ask questions, find answers, and discuss the novel.
I think the final spirit represents Scrooge's last chance at redemption so it needs to be dark and grim. It needs to be silent so Scrooge can really reflect on his life and his miserly ways.
The first ghost to visit Scrooge, the small, elderly figure represents memory. He is kindly and reflective. Ghost of Christmas Present is a giant clad in robes, this ghost has 1800 brothers and a life span of one day. He represents celebration and...
Ghost of Christmas Yet To Come is a solemn, silent phantom that represents death, but also the presents the possibility that the future is not determined, but open to the free will of humans.