Who are Sanhuang, wuhuang and Wudi?

In different ancient books, "Three Emperors and Five Emperors" appeared different versions of the list of characters, namely:

I. Huang San

Fuxi, Shennong and Huangdi; From the pre-Qin ancient book Shiben

Fuxi, Nuwa, Shennong; From Chunqiu Shu and Lv Chunqiu

Emperor, Emperor, Tai Huang; Historical records from Qin Shihuang

Emperor, Emperor, Ren Huang; Excerpted from "Supplement to Historical Records of Huang San"

Suirenshi, Fuxi, Shennong; From The Great Biography of Shangshu

Fuxi, Nuwa, Shennong; Excerpted from "Customs Yi Tong Ba Huang Chapter"

Fuxi, Shennong, Zhu Rong; From White Tiger Hall

Fuxi, Shennong and * * workers; From A Mirror

Second, the five emperors

Huangdi, Zhuan Xu, Di Ku, Yao and Shun; From "The Dressing Ceremony"

Sacrifice, Shennong, Huangdi, Yao and Shun; From the warring States policy

Tai Hao, Yan Di, Huangdi, Shao Hao, Zhuan Xu; From Lu's Spring and Autumn Annals

Huangdi, Zhuan Xu, Yao; From Zi Tongzhi Jianwai Collection