|Voiced by:||Steven Blum|
|First game:||The Warchiefs
|Last game:||The WarChiefs
"Colonel Sven Kuechler prides himself on his strict adherence to Hessian military virtues. Discipline. Obedience. Ruthlessness. There's nothing "soft" about Kuechler's leadership. His job is to extinguish this traitorous rebellion firmly and decisively. And none shall stand in his way for long."
At some point in his life, he became a Colonel in the Hessian army and he and his regiment were hired by Britain as mercenaries.
During the eve of the American Revolution, Kuechler and the Hessians raided Nathaniel Black's Iroquois tribe and took Nonahkee prisoner, but failed to keep her captive for long. Colonel Kuechler soon fought in the American Revolutionary War with the job of extinguishing the colonial rebellion firmly and decisively allied with the British. Colonel Kuechler's first major loss was the Battle of Trenton where his army was suddenly attacked by George Washington and his forces. Soon, during the Battle of Morristown, Colonel Kuechler lead his army to attack Morristown, but was stopped by Nathaniel Black. His colony was destroyed during the battle and he himself was later killed.
- Sven Kuechler is one of the two campaign characters of Age of Empires III with the most attack damage. Sven Kuechler is also the only German character.
- Some believe he is one of the leaders of the Circle of Ossus, though there is nothing in the game to indicate this as he doesn't share the same goals as the other leaders, mainly the Lake of the Moon.
- He considers the British to be soft, as indicated by his derogatory comments towards them.
- Kuechler speaks English when controlled as a hero, whereas most heroes speak their native language.