This is a very complicated question given dozens of factors and as MGE was not created with the intention that there would be a competition or fight, so KC did not put a scale or leave factors like power and skills, aside from those used in night activities, very well explained so much is at the basis of the interpretation. Judging by the elements that you have established the probable answers would be the following:
Brute force: I believe it would be a competition between the Dragon and the Griffin. Hard to say which is stronger.
Magic: Probably Lilim, but if they are all daughters of the monster lord, then I think those with more magic would be the dragon, pharaoh, Ryu or a high-ranking demon, a lich perhaps, but I am disbelieving.
If you put everything together then only the dragon, the griffin, the Ryu and maybe the zombie dragon are left.
However, none of this is clear unless an internal lore is made for this purpose, if you are thinking of doing something on the site that requires it, it is the best thing to do. I hope I have been clear.