[Nantuko Joe]

in fighting games, there is no INSTANT MOVES. as they take energy to make them, all fighting game i saw needed them to build up their strenght with the BOOST buttons. except for Dragonball Z: Hyper Dimension on snes, just like any sf game they need to build their power. i say don't compare games as they are too similar and they downgraded a little the chars. i mean that i don't see vegeta doing what he does in the manga !

I haven't played any of the DBZ games, so I don't know about charging up and doing supers. I was using the anime show as reference. Now, if SF was made into a cartoon (it may have been done already, I'm not sure), I'm pretty sure Ryu wouldn't be able to crank out a Shinkuu Hadoken at the same rate Goku can crank out a Kamehameha.

KI = life force of a characters if its reach 0 then the chars die !

Not true (plus, the way you say it you make it seem like a video game). The fighter's ki (or chi) simply measures how much "spiritual power", if you may, they possess and can use. However, if their ki reaches 0, they don't die, they just get mad-ass weak and can't do #### (think Goku after he got his body back from Ginyu. He could barely reach the toad to throw in front of Ginyu).