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 After that, maybe anda can answer this:
link