Zhang Liao

He is a general of Wei. First serving as a high-ranking commander under Lu Bu, he swore to portray honor above all else. He was asked, then moved to Cao Cao's ranks after Lu Bu became dishonorable, not accepting defeat. His weapon, Blue Wyvern, is extremely similar to Guan Yu's weapon, Blue Dragon. In Dynasty Warriors 5: Xtreme Legends in destiny mode, Zhang Liao states that this is out of respect for Guan Yu, as the two had become close in their time serving Wei.

Warriors Orochi
In Warriors Orochi 2, Zhang Liao is not seen until the Battle of Jia Meng Gate, where he appears by orders of Cao Cao to assist Guan Yu in defeating Kiyomori. In this battle, he appears to reveal to Guan Yu to inform him that the defeat of the phantom soldiers is done by killing the sorcerers who control them. The two warriors accomplish that task and move on to defeating the Sun Wukong doubles only to find more sorcery at the gates. Eventually the two overcome the poison gas and defeat Kiyomori together.

Zhang Liao is also present at Koshi Castle where he takes a northern path to take out the northwestern garrison to stop the cannon fire.

Kessen
Zhang Liao is a general for Cao Cao in Kessen II. He often leads one of the physically strongest armies for Wei with a mixed footman and cavalry unit. He's an old friend of Guan Yu and they once fought a decade ago over a woman. However, Guan Yu let him win their battle and allowed Zhang Liao to marry her.

In the beginning of Wei's story, the old friends will have a friendly bout in battle. He asks his friend if he has a lady and promises them a safe escape. Guan Yu refuses, stating that a man fights for the ones close to them. In response, Zhang Liao wins their scuffle and earnestly tells him to not disappoint his woman.

Dynasty Warriors 5

 * True Musou : A series of left and right slashes followed by an upslash, then a fireball.
 * ,undefined: Releases a disc flying down from his weapon.

Dynasty Warriors 4
At the battle of Si Shui Gate, defeat Liu Bei, Cao Cao, and Sun Jian. Then, at the battle of Hu Lao Gate, do not kill any generals till after the fire attack on the city. Once that occurs, eliminate Liu Bei, Cao Cao, and Sun Jian.
 * Power: 56
 * How to get it: Battle of Hu Lao Gate and Si Shui Gate

Dynasty Warriors 5
On Hard either defeat 9 Generals/Sub-Generals or defeat 700 people, every few enemies the enemy soldiers will comment, you get the valuable item report when Sun Quan comments that "one man struck fear in my entire army by himself", requirements must be done before Cao Ren arrives.
 * Power: 36
 * Weight: Medium
 * Attributes: Fill|15 Luck|15 Horse|18 Attack|17 Life|17
 * How to get it: Battle of He Fei

Trivia
In Dynasty Warriors 6, Zhang Liao wields two halberds, which were the weapons of choice for Dian Wei in Romance of the Three Kingdoms. Pang De also wielded dual halberds in his appearances, though these were longer in size.