pretty sure those are gods from some religion in the real world, maybe slightly changed to match the series but have nothing to do with So6P..
Kishi and his brother both base alot of what they write on Mythology from all parts of the world, the tailed beast are all some mythological story behind them, the "real names" they have are also from mythology stories such as Gyuuki(8tails) Shukaku(1 tails) etc..
But those statues look like Buddhist figures, maybe Krishna the God of Creation and Destruction, notice both have 6 arms..one is peaceful and one is war-ready..looks like Kishi's version of Krishna to me since Krishna could either be the Creator or Destroyer at any time..and male or female..