Just for Clarification, Kratos in no way was a God... he was the son of Palos of Styx and was one of the Four Winged Sentries of Olympus. He represented *Strength*.
and for Gods, I would have to choose... hmm... so many... Aether, one of the Protogenoi (Primordial Gods). Aether both represents a being and a thing which the gods breath. The reasoning as to why he is my favorite God is because... I suppose I use him in my books.