The Agguguy is a mobile suit introduced in Mobile Suit Variation and made its animated debut in Mobile Suit Gundam ZZ.
As Zeon prepared for its massive invasion of the Earth Federation Force's underground military headquarters of Jaburo, the Zeon military engineers stationed at California Base began developing several specialized mobile suits to aid in the assault. One of these designs was the Agguguy, an amphibious mobile suit based on the MSM-04 Acguy.
The few Agguguys that were constructed at California Base did not participate in the assault on Jaburo because Zeon Commander Char Aznable discovered a secret entrance to the subterranean base and launched the attack much earlier than originally planned. After the One Year War ended, a few Agguguys eventually wound up in the hands of civilians at the Tigerbaum colony, and can be seen in the series Mobile Suit Gundam ZZ.