A benevolent platinum dragon, Bahamut is the draconic god of justice. He has battled Tiamat (his evil sister) for centuries, at one point even losing his immortal status for a period of time.

Tchazzar isn't at the top of the food chain in terms of DnD dragons, serving underneath the dragon goddess Tiamat. In that capacity, however, Tchazzar took on a role that puts most to shame.

This would fit him because Nusjuro's Gorosei title (Warrior God of Finance) matches the green head's theme of corruption. The blue head of Tiamat would belong to Saint Warcury, who has the Houki ...