Zhang Liao

He is the spear welder 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 and didn't accept defeat. His weapon, blue wyvern, is exactly the same as 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
"I, Zhang Liao, have come to strike fear into the heart of Wu and will destroy the kingdom of Shu! Won't you gladly join me and lead Wei to total conquest."
 * undefined: Rushes forward spinning his blade in front of him then does a horizontal slash.
 * ,undefined: Knocks opponent airborn with an upward diagonal swing.
 * ,,undefined: Swings his blade diagonally in front of him multiple times, in the opposite direction each time then finishes with a broad swin.
 * ,,,undefined: Pivots on one foot with his spear held in front of him.
 * ,,,,undefined: An upward swing that releases a small white tornado in front of Zhang Liao.
 * ,,,,,undefined: A large gust of wind and energy.
 * A series of downward diagonal slashes then a horizontal slash repelling opponents.
 * 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

He weilds 2 halberds called Twin Vipers in Dynasty Warriors 6.