I think it's unfair to compare five different characters who are set up to fight varieties of different enemies in their own series. If I had to choose rationally though from what I've seen, I'd automatically cross out Luffy, Ichigo, and Naruto. Come on. Goku and Superman overpower all of them. I love Ichigo, but he isn't as indestructible as SM. Now, I actually haven't watched DBZ (ikr) but I say it's a tie between super and goku.
This is how I think it's gonna go.
1) They attack superman and say YOURE NOT AN ANIME!
2) Next they gonna gang bang luffy cuz he only freakin stretches his arms and left boulders WHO CANT DO THAT?!
3)Naruto will split ichigo's sword in half with his chakra arms and if he goes invisible just remember that naruto is a sensory type. We all know what happens after that
4) Finally the battle people been talking bout for years: Goku vs Naruto
NARUTO WILL WIN. Unlike Goku naruto is serious in battle and we all know Goku is pretty childish. All naruto gotta do is a speed shot with a mini tailed beast ball and it's his.
I hope I helped.
Naruto and Goku will team up.Naruto has no hatred.he will sense hatred levels and team up with Goku.
Anyway superman,who doesn't know to wear his underwear, would lose
Naruto lol. Truthfully. Or Ichigo. Dunno. Probably they' died fighting each other IF they ever clashed... Goku's out... Luffy... Yeah probably would stand a chance against Naruto and Ichigo should it ever come to a three way battle for the win. And superman? Sure his strong and all but against Naruto's RansenShuriken he's dead. I mean look at Kakuzu! He got sliced to bit! ON THE INSIDE! Serious powers his up against if he went against all of them. So in the end confirmed people dying in this battle are as follows...
SUPERMAN! ( heh, his first one to die)
Goku is still in the game if he uses his dragon balls so, his still game but not against the three power houses.
But I'm betting my money on Uzumaki Naruto! Why you ask? Because he has the power to defeat anybody! He is determined and if you watch Naruto, he never gives up and always comes out on top! Yay!

I agree with Dhania Camelia and Pei. And this is a message from Dhania Camelia to Pei, the comment is not meant for you but for the other dude who commented on your awesome answer. That guy's the stupid one isn't he? I'm a close friend of Dhania Camelia, and she forgot to add the part about it's for the other guy and couldn't edit it. So... Pei, I and Dhania Camelia totally SUPPORT YOU!!!
The winner is the person who stops grouping characters utterly different from each other together to ask "who would win."
goku
first place:Goku
2nd: Luffy,
3rd: naruto
GOKU, BUT I THINK THEY TEAM UP TO KILL ALL THEIR ENEMIES
in an allout battle who would win. no character bashing unless its luffy