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First off, let me say that Luffy vs. Goku isn't a match. This would be a one-sided beat down with Goku not even having to use much of his strength to defeat Luffy. Even Krillin would beat Luffy with not much effort. Still, this is a pretty sweet pic and even I can put aside my knowledge of the outcome to take in its awesomeness.
Comments
If you haven't seen Eyeshield21 I advise you to watch it, when you reach ("deimon Devil Bats" vs. "Dragons") your going to believe it with your own eyes
DON: Dragon Ball vs Onepiece vs. Naruto?
Just wanted to tell you about it, nothing more
And cause no one demanded it...*Ahem*
Buu: "Why you go down? You no play?"
Goku: "We'll get to that, but first, I thought I'd take a minute to teach you a thing or two about Saiyans...Staring with, the basics."
Buu: "Super...Saiyan-jin?"
Babidi: "Don't both with it. I never asked you to explain anything."
Goku: "You're going to love this---Trust me! What you're seeing now is my normal state."
*Fwasp!*
"This is a Super Saiyan. And this..."
*Kzznng!!*
"...This is what is known as a Super Saiyan that has ascended past a Super Saiyan. Or, you can just call this a Super Saiyan 2."
Buu: "Oh! Oh ho!" /Curious
Babidi: "Ho-hum, what a useless transformation. You've change your hair---so what?"
*Goku chuckles to himself while busting out 'that smile'.*
Goku: "Just wait!"
*Other characters muse on a new state being possible*
Goku: "And this..."
Master Roshi: "Eh?! Whats...he...doing?!?"
Goku: "Is...to go---even further---BEYOND!!!! EAHHHHHHHHHHHHH!!!"
Piccolo: "Nghh!! *Eyes wide* It's...Unreal! How is he generating that much *power*!"
Goten: "Do it, dad!"
Krillin: "Nnn---Too hot!!"
Tien: "It feels like the whole world is shaking apart! What is Goku doing? If he doesn't stop this, everything is going to be destroyed!"
Mr. Satan: "Ghhh!! *Flop* Please, somebody make him stop!!"
(etc)
*Babidi sweats balls*
Goku: "I'm sorry that took so much longer than the others, heh, but I've not had much occasion to practice this one. This is what I call a Super Saiyan 3."
----
Anyways, the only real way to have a chance against the DBZ characters is to have a certain power that puts you on a somewhat equal playing field and/or know who you're dealing with.
For instance, since Goku didn't outright destroy Captain Ginyu when they fought (Goku is a nice guy & gives chances), Ginyu was able to use a body-swap technique. Stuff like that is your best chance short of blowing up the planet (which Kid Buu does during the last story arc).
If you had a vs match against Vegeta, appealing to his vanity (this is before he turns over a new leaf at the end of the series) to buy time to do something is your best bet, as was the case with Cell achieving his perfect form.
Tommy, bravo!