Mobile Suit Gundam(1979) and Mobile Suit Gundam ZZ
Watch this video first to see what characters are playable in dynasty Warriors Gundam Reborn first: link Then can anda answer this: link
anda may need to watch Gundam ZZ, if anda haven't, then answer this. anda can start with Episode 1, but that's a clip show: link So I recommend starting with Episode 2: link