He is the dazzling, whiter-than-white deity whose goodness gleams brighter than white socks in a laundry detergent commercial.
He is sometimes depicted as an old man dressed in white, with a long white beard and a staff. But he only appears in the daytime. That probably rules out Gandalf.
Unfortunately the baddie appears to be winning, as all trace of BELOBOG has been obliterated from ancient records and his very existence is in doubt. It seems you just can’t have a God of Evil running around without a God of Good popping into existence to balance things out.