Zhu Rong is the Fire God of the South. In the Classic of Mountains & Seas, he is decribed as having a beast-like body and human face, riding around the sky on two dragons.
He is best known for defeating the Water God, Gong Gong (共工 gòng gōng), in an epic battle across Heaven and earth that ended with Gong Gong, bitter in defeat, crashing in to a mountain and tearing a whole in the Heavens.
His heritage is unclear. In the Classic of Mountains & Seas it states that his 3rd great grandfather is Yan Di (炎帝 yán dì), but in the Classic of Regions Within the Seas and Classic of the Great Wilderness: West (both of which are chapters of Classic of Mountain & Sea - 18 and 16 respectively), they state that he is a descendent of the Yellow Emporer (皇帝 huáng dì).
For some reason (further research needed) in recent years, artists have started portraying Zhu Rong as a woman, though it is clear from early illustrations in ancient texts that he is, in fact, male.
Zhu Rong the Musician
According to one legend, Zhu Rong is a bit of a musician. It is said that one could often see Zhu Rong at the top of a mountain playing melodious music to the people below, filling them with energy and sparking a new joy for life.
After he died, the highest peak of Heng Mountain (衡山 héng shān) in Nan Yue (南岳 nán yuè) was named after him - Zhu Rong Peak (祝融峰 zhù róng fēng).