Yeh-Lu

Yeh-Lu was the master of explosives of the Fire Nation group titled the Rough Rhinos.

History
In the spring of 100 ASC, Aang, Katara, and Sokka were rudely awoken by the arrival of the Rough Rhinos who attempted to capture the Avatar. The team managed to escape, but Sokka's boomerang, however, was left behind and subsequently claimed as a spoil of war by Yeh-Lu.

The explosives specialist was seen again not much later when he and the rest of the Rough Rhinos invaded the Chin Village and claimed it in honor of Fire Lord Ozai. Aang and the Water Tribe siblings helped in the defense of the village. During the fight, Sokka distracted Vachir by reflecting sunlight in his magnifying glass. The archer blindly shot a burning arrow in Sokka's direction. The arrow missed the Water Tribe warrior, and embedded itself instead in the saddle bag attached to Yeh-Lu's rhino. Sokka smiled and ducked for cover as the bag, containing five sticks of dynamite, caught fire. Yeh-Lu immediately saw the danger and tried to save himself by throwing the bag on the roof of a neighboring house. However, the house collapsed under the thunderous explosion; the force of the explosion slammed Yeh-Lu and his mount against a wall. As Sokka looked up again, Yeh-Lu's helmet rolled by and a bag with Sokka's boomerang landed next to him.

Later that spring, the Rough Rhinos, hunting fugitives, ran into Iroh and Zuko who were traveling through the Earth Kingdom as refugees. When the two fled on their ostrich horse after quickly disposing of four of the five Rough Rhinos, Yeh-Lu was the only one still capable to ride in pursuit. In an attempt to halt the royal fugitives, he threw a grenade in the path of the fleeing ostrich horse. The grenade exploded ahead of the animal, but Iroh and Zuko pushed through and emerged through the dust of the explosion. They rode away to safety as Yeh-Lu seized his pursuit.

When Team Avatar, Smellerbee, and Longshot tried to help Jet to overcome the Dai Li's hypnosis, it became apparent that Yeh-Lu had taken part along with the rest of the Rough Rhinos in the destruction of Jet's village, which had led to the death of both his parents.

The ultimate fate of him and the Rough Rhinos after the end of the War is unknown.

Trivia

 * "Yeh-Lu" comes from Yeh-lu Chu'tsai the Magician, a great statesman and Genghis Khan's chief of the secretariat.
 * "Avatar Extras" erroneously referred to Yeh-Lu as Vachir.
 * Yeh-Lu can be seen in Jet's flashback behind Colonel Mongke.