The pilot of the gun-toting Gundam Heavyarms, the boy who calls himself Trowa is the most mysterious of the Gundam pilots. Calm, cool, and detached, he seldom speaks and never smiles. Trowa falls in with a traveling circus troupe as cover for his terrorist mission, finding employment as the world's most dispassionate clown. Trowa is a gifted and fearless acrobat, and these abilities also prove useful in his alternate occupation as a Gundam pilot.

Despite his youth, Trowa is an experienced professional soldier. His preferred combat tactic is to stand his ground and spray the battlefield with an endless hail of bullets, though every now and then he'll dispatch an enemy with his acrobatic trademark move - a mid-air triple spin, ending in a deadly knife slash.  Trowa pilots the Gundam Heavyarms Custom after Heavyarms is destroyed and rebuilt.