Zongi

"'Yes... Excellent. This is an excellent body.' - Zongi"

Zongi is a Doppelganger who serves under Folken Fanel in the Zaibach Empire.

After accidentally killing his brother, who had taken the body of an enemy soldier, on the battlefield, he was taken in by Folken, who showed him compassion and promised him a better life in Zaibach. Since he is a Doppelganger, he is able to drain the life from people and inhabit their bodies, leaving only a shriveled husk behind.

After Miguel Lavariel is captured and imprisoned, Folken sends Zongi to take on the body of a priest, Plaktu, in Freid, to replace him in the interrogation. In this way, he feeds false information to Miguel. Miguel accuses Allen of plotting to rebel against Asturia, and Allen, Hitomi, and the others are taken prisoner.

Still in Plaktu's body, Zongi interrogates Hitomi, and finds out that she is from Earth and about her power of dowsing. However, the interrogation is interrupted after Zongi has Hitomi show him her power, and they end up in a vision. Hitomi sees Zongi's past, and tells him that he will die, witnessing him being crushed by liquid metal. Zongi escapes, but Hitomi is haunted by the vision of his death.

Since Miguel found out about Zongi's true nature, Zongi kills him after he breaks out of prison. In retaliation, Dilandau threatens to kill Zongi by crushing him to death with the liquid metal in his Alseides Guymelef's Crima Claw. Hitomi sees a vision of his death and screams as Zongi is murdered by Dilandau.

In the aftermath of Zongi's death, the shriveled husk of the real Plaktu is discovered nearby, therefore confirming that Zongi took over Plaktu's body and absolving Allen, Hitomi, and the others of the false accusation of treason.