Ultimate Marvel vs Capcom 3 General

I clearly remember winning the first game of Tatsunoko vs. Capcom I ever played like... three weeks ago just by spamming his forward slash. I then parlayed this success into pressing some random buttons after that to hopefully get a combo. I have no idea what you mean by no stamina. o_o

By stamina he means Zero can't take a hit, that for example 10 hits to the average fighter will deal more damage to Zero even though it's still 10 hits. Think comparing Snorlax to Charizard. A Hyper Beam done to Snorlax doesn't take off as big a percentage of his health as compared to when a Hyper Beam is done to Charizard, because Charizard has less stamina that Snorlax. A more extreme example is Brozong taking a hit in comparison to Chansey or to Lucario.