Zack Fair : story
Zack Fair is an NPC (non-player character) from Final Fantasy VII and the protagonist of its prequel, Crisis Core: Final Fantasy VII. He is also a central character in Last Order -Final Fantasy VII-. In Final Fantasy VII, Zack only appears in flashback sequences, which portray him as almost identical to Cloud Strife, the game's main protagonist, in physical appearance except having black hair and his pauldron being on both shoulders. When strung together, the sequences explain a great deal about Cloud's past and his connection to Sephiroth, the game's arch-villain. He also wielded the Buster Sword before Cloud. His default Limit Break (DMW) is Chain Slash, but he gains others during Crisis Core.
Like many other 1st Class members of SOLDIER, Zack has a fan club, of which is known to have had at least 109,384 members by the end of Crisis Core: Final Fantasy VII. 
In crissis core, Zack first appears in a digital training session with Angeal Hewley, who seems disapproving of his reckless attitude towards his enemies and himself. Despite this, he approves of Zack as a member of SOLDIER, and requests to Director Lazard that he be sent on his own mission in Wutai. Shin-Ra had been at war with the Wutai for a good time by now, and SOLDIER 1st class Sephiroth had already become a hero of Shin-Ra for his actions there.
Though Zack was ecstatic over Angeal's suggestion, he received some interesting news during the briefing: 1st Class SOLDIER Genesis Rhapsodos had deserted Shin-Ra, taking an untold number of 2nd and 3rd Class warriors with him. He had to be found and stopped.
After Zack took out the forces of Fort Tamblin singlehandedly, Zack met with warriors in strange armor. Sephiroth identifies them as copies of Genesis. Realizing that these were the soldiers that Angeal had last been seen fighting, and that he was no where to be seen as well, Sephiroth comes to the conclusion that Angeal left with his long-time friend: Genesis. Zack however, refuses to believe that his mentor would ever desert Shin-Ra.
Zack now fights against the forces of Genesis while meeting up with several other characters of Final Fantasy VII and uncovering the truth behind Project G. He fights armies of Genesis Copies in Genesis and Angeal's hometown of Banora Village with the Turk Tseng. Zack's hopes are shattered, however, when he finds Angeal standing over the body of his mother, Gillian Hewley. Zack is horrified that Angeal could do something so horrible to his own family, and is badly shaken. After he defeats Bahamut, whom Genesis had summoned, Zack questions Genesis about what happened to his dreams and honor. Unfortunately, Genesis only declares that they are monsters and flies away with a wing hidden beneath his coat, leaving Zack as Tseng arrives to pick him up as the village is bombed.
Next he is sent to back to his home base of Midgar, where Lazard gives him the title of SOLDIER First Class (most likely to replace all the Firsts who are gone). Zack is not happy that he attained his dreams so early, and after so many losses. But then, Genesis's army attacks Midgar, and Zack has to fight them throughout the city. Along the way, he saves Cissnei, another member of the Turks. Sephiroth and Zack both head to the Sector 5 Reactor to find the rogue Dr. Hollander who is suspected of working with Genesis. Zack chases Hollander through the Reactor, until he runs into Angeal, now with a white angel's wing and believing himself to be a monster. Refusing to fight his old friend and mentor, Angeal is forced to drop Zack down into the slums.
In the Slums of Sector 5, Zack meets Aerith Gainsborough. Grateful for saving his life, Zack offers to pay Aerith a fee of one date. Zack suggests that Aerith should sell the flowers that only grow in the Sector 5 Reactor. Later on, Zack gets his wallet stolen by a child, and would eventually find him, only to find that the child's wallet was eaten by a monster. In generosity, he lets the child keep his wallet in order to buy some medicine, or you can choose to take the wallet back from the monsters. That being done, it happens that the kid had a lot more money in his wallet than in Zack's. Zack then buys Aerith the ribbon that she is seen wearing throughout the series. It was also revealed in a DMW reel that Zack wanted Aerith to wear all pink when he was around. However, their date is cut short when Zack has to return to the Midgar Plate to defeat Genesis. He protects Professor Hojo during this time. Angeal rejoins Zack, and together they drive Genesis out of Midgar. Zack would have to face Bahamut Fury while Angeal deals with Genesis.
