Eternal Growth Arc, Chapter 39
Aerial receives an explanation from Goofy about Mimi-san and Nobishiro, and understands that Akafun was incomplete.
However, perhaps because it was assumed that it would be obvious from appearance, the true identities of Akafun and Omaru-man were not revealed.
Amuro XIII: "By the way, are they going to stay like this forever?"
Z'Gok: "That would be a problem! No amount of alcohol would be enough in this body!"

Gunpla Theater: "The Instruction Manual for Growth Potential" | キャア's Gunpla works