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Tseng is the leader of the Turks in the Final Fantasy VII series. He first appeared in the original game, but has since appeared in Before Crisis Final Fantasy VII, prequel to Final Fantasy VII with the Turks as the main characters; in Final Fantasy VII: Advent Children and Crisis Core Final Fantasy VII, and also appears in the OVA Last Order Final Fantasy VII, which depicts the events of the Nibelheim Incident from the Turks' point of view.

Tseng dons the classic, dark blue Turk attire in Final Fantasy VII, and wears a similar, but black suit in the Compilation of Final Fantasy VII and Final Fantasy VII Remake. He has dark brown eyes and shoulder-length, black hair occasionally tied in a ponytail. He has a tilak in the middle of his forehead.
Tseng removes his ponytail and lets his hair fall in Before Crisis Final Fantasy VII after Rufus Shinra spares Tseng from ex*****on due to his perceived loyalty to the company. This is a token of deep dishonor in Chinese culture. In Crisis Core Final Fantasy VII,?when Tseng is ordering Cissnei to return the runaway Nibelheim "specimens" alive, his hair is up in his Crisis Core hairstyle, but when the scene switches to an FMV, his hair is down in his Final Fantasy VII hairstyle. It is implied Tseng has been promoted to the leader of the Turks for international players who have not played Before Crisis Final Fantasy VII.

Tseng is stern, no-nonsense, and sometimes temperamental. He has known Aerith Gainsborough since she was a child and has special feelings for her, thus never completing his long-delayed mission to bring her to the Shinra Electric Power Company. In spite of several instances of ruthlessness (such as striking Aeris as she was trying to assure Barret and Tifa that Marlene was safe), he is devoted to his associates and friends, as he sent out the Turks to save Zack and Cloud before the Shinra Army could catch up with them, a failure which torments him throughout the Compilation.

Ruby Weapon is one of the two superbosses of Final Fantasy VII, along with the Emerald Weapon. It is one of the three Weapon enemies added in the North American, PAL, and International versions. Ruby Weapon is one of seven Weapons the Planet has produced and dispatched to cleanse any threats to its continued existence.

Ruby Weapon is an optional boss that resides in the sand around the Gold Saucer in the Gold Saucer Area. The player must defeat Ultimate Weapon and then fight one random battle afterward to trigger Ruby Weapon's appearance, although some players have reported Ruby Weapon not appearing at all, or that it appears but is invisible and the player can only initiate the battle by running into it by chance.

The player can only approach Ruby Weapon by Highwind or chocobo. It can eject party members from battle, has extremely high defense, inflicts targets with status effects by its tentacles, and uses some of the strongest attacks.

Defeating Ruby Weapon in the PC version re-release unlocks the Ruby Weapon achievement. Doing so in the PlayStation 4 version earns the Ruby Render trophy.

The Desert Rose Ruby Weapon drops can be traded for a gold chocobo that can be used for accessing the four Materia Caves, but its stats are poor for racing.