A legendary swordsman of SOLDIER (Shinra's elite guard) who was once revered as a hero. However, when Sephiroth learned he owed his existence to Shinra experimentation, he developed a fierce hatred for the human race. That hatred soon became a genuine threat to the planet itself. And though Sephiroth lost the great battle, even now his shadow lingers in Cloud's path.
Sephiroth is evil. In FFVII he becomes obsessed with the fact that his mother, jenova, is an ancient and that he is technically one too, and he becomes enraged, hating the human race. he wasn't born, but created, like Cloud was. He becomes the main enemy to Cloud and his group.

Son of President ShinRa, Rufus was Vice-President until the sudden death of his father at the hands of Sephiroth. Rufus was then promoted to President of ShinRa Inc., and immediately made clear his desire to rule by fear rather than money. He pursued Sephiroth in an attempt to find the Promised Land -- a journey that led him to face down the Diamond Weapon as it tried to destroy Midgar. The Weapon shot a powerful blast that destroyed the ShinRa tower, but Rufus survived due to timely rescue by paramedics.
Two years after FFVII, Rufus was infected by Geostigma and received treatment at the Healin Lodge, his sores covered by bandages (although in a wheelchair, Rufus was able to walk and only confined himself to it as part of his "performance"). He attained Jenova's head from the Northern Crater, and sought Cloud's services as a bodyguard to protect it from Kadaj, Yazoo and Loz. His request was turned down, and Rufus was later kidnapped by Kadaj, which led to a showdown between the two.

Loud, reckless and laid-back, Reno was put in charge of the Turks after Tseng was injured, belying his seniority despite his slacker appearance. He is usually seen fighting alongside Rude.
He fights with an electric rod and communicates easily with his supposed enemies, AVALANCHE, as shown when he called Tifa to request for Cloud's services in Advent Children. Reno and Rude also brought Cloud and Tifa's unconscious bodies back to the Seventh Heaven after Tifa's battle with Loz. Although refusing to follow Cloud's wishes to rescue the children in the Sleeping Forest, Reno and Rude assisted in battling Yazoo and Loz respectively in Edge.

The complete opposite of his boisterous partner, Rude is the quiet, composed other half. He fights bare-fisted and is always seen wearing dark sunglasses, although they were accidentally broken by Reno in the fight with Yazoo and Loz. Nevertheless, Rude always has an extra spare should that happen.
He has admitted to having a crush on Tifa, and assisted Reno in bringing Cloud and Tifa's unconscious bodies back to Seventh Heaven. He also accompanied his partner in facing off against Yazoo and Loz in Edge.

Leader of the Turks, Tseng served President ShinRa and, later, Rufus directly. Although he cared for Aerith, he kidnapped her under President ShinRa's orders and later traveled to investigate the Temple of the Ancients. It is there that he was severely injured by Sephiroth, but was able to recover and return to duty.
He and Elena investigated the Northern Crater in the later half of the two years preceding Advent Children, but they were caught and tortured by Kadaj, Yazoo and Loz. Their bloodied identity cards were presented to Rufus as proof. Tseng made another comeback as he and Elena were present to support Rufus after the ex-President's showdown with Kadaj.

A rookie Turk, she was promoted to join her seniors when Reno was injured during the plan to destroy Sector 7. A bit light-headed, with the tendency to reveal core information to the enemy, Elena was nevertheless extremely loyal to her boss and focused on carrying out her duty as a Turk. She harbored feelings for Tseng, and took his injury at Sephiroth's hands extremely personally.
She accompanied Tseng to investigate the Northern Crater after FFVII, only to be defeated, caught and tortured by Kadaj, Yazoo and Loz. She made her return to back Rufus up after the latter's showdown with Kadaj.