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 wewe answer this: link
wewe may need to watch Gundam ZZ, if wewe haven't, then answer this. wewe can start with Episode 1, but that's a clip show: link So I recommend starting with Episode 2: link