Celestine

Celestine was a high-ranking deity in Heaven, holding one of the seats on Heaven's council. He acted as Belldandy's mentor for the majority of her training, starting from when she was a young girl.
Eventually, Celestine witnessed excessive suffering in the third dimension. He knew that Belldandy would eventually become an agent for the Goddess Relief Office, and he did not want to expose her to such a cruel world. His plan was to accelerate time on Earth so that the world would evolve beyond hurting itself.
In the end, Celestine failed. He failed to realize that although this method would cause things to age, it would not cause them to mature. Belldandy was happy on Earth, living, learning, and loving. He left peacefully after he had realized this.