The XXXG-01H2 Gundam Heavyarms Kai (aka Heavyarms Kai or Gundam Zero-Three) is the upgraded form of the original XXXG-01H Gundam Heavyarms. The suit received a major design change for the OVA Endless Waltz, with a dark blue and light blue color scheme instead of the traditional red and white. The unit is piloted by a young man operating under the pseudonym Trowa Barton.