Great question — answering as the UphillTech team:
There are 6 different accepted universes within the Gundam Multiverse. Each has its own characters unique to its timeline, and does not intersect with any other timelines (ex: In Gundam Wing, the events from Mobile Suit Gundam never happened). They are listed as follows: Universal Century Time line (Best place to start to get into it, every single Gundam series out there is rooted in characters/gundam from this time line). In order they are: Mobile Suit Gundam Mobile Suit Zeta Gundam Mobile Suit Gundam ZZ Char's Counterattack MS Gundam 0080: War in the Pocket MS Gundam F91 MS Gundam 0083: Stardust Memory MS Victory Gundam MS Gundam Unicorn. Turn A Gundam (This series is really good and is a...
Full answer by Tamz_m: https://anime.stackexchange.com/a/28243 (CC BY-SA 4.0).
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