>>718547670
How I interpreted it was that the add-ons were the manifestations of Hugo's promises with the guardians. The fact that they fight alongside the Batter was just another hint that the Batter's mission was something that Hugo personally condoned.

Interestingly, the French version has a detail that was butchered by the translation: Dedan's calendar has Hugo's notes on it, implying that he was the only guardian who still remembered Hugo and valued their promise.