Unit 1, Ropponmatsu

Intended as a versatile, albeit aesthetically pleasing, instrument for Kabapu, Ropponmatsu (Unit 1) specializes in bomb disposal. Following her failure on the initial mission, she receives an additional form (Unit 2), appearing as a cheerful, young cat-girl. In the original manga, only a single Ropponmatsu unit is operational at any given time; this is later explained by the existence of just one central "core" that is transferred between the two bodies. Kabapu confirms that this core houses the soul of the princess from the lost civilization of Solaria, and he commissioned the Ropponmatsu body to contain it as part of his scheme to eradicate all remaining traces of Solarian technology. In contrast, the anime (produced prior to this revelation in the manga) portrays the Ropponmatsus as two separate entities who often collaborate on significant tasks. Although they are prone to destruction during their missions, Shiouji maintains a large stock of replacements, which feature prominently in the series' penultimate episode. The significant disparity between the units creates tension between Kabapu and Shiouji: both versions of Ropponmatsu tend to fail in their duties, either due to excessive mass (Unit 1) or insufficient functionality (Unit 2).