Mine is pic related, the Victory Gundam. What I like about it is how modular the mobile suit is. It's the result of years of ms tech late into the Universal Century where now the Gundam is mass produced. In the show the rebel forces are shown to have a stockpile of Gundams in a bunker so they can burn through parts.
Honorable mention to the RX-79 G ground type Gundam from 8th MS Team.
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The Rick Dias is one of my all-time favorite anime robots.
"What if the Rick Dom was just a friendly little guy?" seems to be the concept to me lol
Rick Dias is def S tier imagine if ur name was rick diaz