"Come on! You want to know what Frank Zhang is worth? Come on!"Frank Zhang (also known as Fai Zhang by Grandma Zhang), is a Roman demigod of Camp Jupiter and one of the main protagonists in The Heroes of Olympus series. He is the son of Mars and Emily Zhang, as well as a legacy of Poseidon. Frank is one of the seven demigods mentioned in the Prophecy of Seven.
Frank is the son of Mars and mortal military soldier, Emily Zhang. From his mother, he is a descendant of Periclymenus, who was a grandson of Poseidon and a member of the Argonauts, hence making him a legacy of Poseidon. He was blessed by the god with the power to shift into any kind of animal from human form. In the absence of his immortal father, Frank's grandmother helped to raise him after his mother died in a military accident in Afghanistan.
Frank combined his ancestral gift with the powers that he inherited from his divine parent. As such, he was considered to be dangerously powerful, and it was decreed that he would have a short life. At the night of his birth, Juno appeared to his family and pointed out a piece of timber in the hearth, warning that if it was burned entirely he would die.
His grandmother gave him the piece of firewood when she knew that he would soon be leaving to go to Camp Jupiter.Lupa and her wolf pack arrived at the Zhang Mansion, and he went through the usual process of proving his strength at the Wolf Manor. Frank arrived at Camp Jupiter about a month after Jason Grace disappeared, and was still on Probatio when Percy Jackson arrived. When Frank arrived at Camp, his grandmother instructed him to go to the Praetor and tell her that his great-grandfather was Shen Lun and to beg forgiveness for what Shen Lun did, though she refused to tell him what he did. When Frank arrived at camp, he went to Reyna Avila Ramírez-Arellano and did as he was instructed. Reyna told him she judged people by their own merits, not what their ancestors did. However, she did tell him not to mention Shen Lun to the other campers at Camp Jupiter, as they'd be less understanding than her.