Sodom's Beast/Draco (Arcade)

I finally get both Dad and Mom (Draco & Tiamat) this event really kind to me... getting both only cost 60 SQ in total... hoping you all roll went so well GUYS !!!

Hey, I must ask but what's difference between 2 of those, like who is good and who is evil between those and etc. bc Im so confused. And also why is one alter ego and other beast?