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 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 DW5:XL 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.

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.