This stern, no-nonsense wolf is in charge of keeping the coals of Ogun's forge stoked 24/7--letting it go out is not an option. He is wearing a spectacularly elaborate golden mask, made by Ogun, no doubt.
He also oversees the day-to-day operations of the Rookery, one of the main living areas in the Ruins. Once, Aganju watched the Spire, but now Sango does that. Just like Ogun, he appears to have fur missing from burns, making you wonder if an eternal forge is maybe just not all it's hyped up to be.
His scars were inflicted by his brother, not that anyone wants to really talk about that day.