Note: in this fanfiction, Touma only has the power he is known for in the beginning of the series: any possible extra power that could somehow come up later is not relevant.
Goku has the abilities he is most famous for.

Today we are about to witness another special duel between incredibly strong people!
Let me summon the one and true Goku super Sayan and Touma Kamijo!

On my left, the crazy hair guy who fought gods and trained like crazy for years, and let's not forget a plethora of superpowers he can use to destroy planets! Welcome Hairguy!

On my right, the boy who can deactivate any power with his right fist! Ladies love him, even though he doesn't know! He usually defeats his enemies with one punch! Welcome One Punch Man!

Oh no wait, that might be copyrighted.

Welcome TouMan! Because the fandom calls him that!

Ready? Fight!

"KAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA..."

"What is this? Why am I here? Who is this guy?! Is he attacking me? Such misfortune!" Cried TouMan, desperately.

"MEEEEEEEEEEEEEEEEEEEEEEE..."

A ball of energy appeared between Hairguy's hands.

"HAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA..."

"How long is this gonna take?

"MEEEEEEEEEEEEEEEEEEEEEEEEEEEE..."

"Is that an energy ball of some sort? What kinda magic is it? Well, no matter what, I'll erase it!"

"HAAAAAAAAAAAAAAAAAAAAAAAAAAAA!!!!" with this last syllable, Hairguy released his attack, a huge energy wave covered the distance between them and hit TouMan's hand within an instant.

So, technically Imagine Breaker, TouMan's power, can only erase illusions, and in Dragon Ball's universe those powers are not illusions. In that world, those are REAL, TANGIBLE realities. They do not work like powers from the Toaru universe. So, in theory, TouMan shouldn't be able to erase the attack and should die. But let's forget about this for a second and assume he DOES stop the attack.

"Heh." TouMan smirked at his opponent, proud that he received no damage at all thanks to the author needing to make a longer chapter.

Hairguy couldn't believe his eyes: "NANI?!"

"My turn." TouMan collected all the confidence derived from his perfect defense and ran towards Goku, punching him in the chin.
As his fist hit Hairguy, a loud sound of broken bones filled the air.
TouMan's bones, to be exact.

To be fair, Hairguy DID feel the attack. Not that it hurt, though. Kinda like John Cena would feel a punch coming from a sick child who could barely move.

Goku was very confused: "Uh... ouch? I guess?". As TouMan rolled on the ground, cursing his luck, feeling the immense pain of having his right hand broken (again).

"Am I seriously supposed to fight this guy?"

Yes.

"I see he can block my non-human powers... so I'll try and punch him."

~•~

The next day Index, TouMan's very good friend (shippers may take this sentence as they want), wore a black robe, for obvious reasons.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Author's note: I had a lot of fun writing this one. It's silly, and honest.

I never had the chance to watch Dragon Ball (due to family reasons), but I have a vague idea of the show. And I had to check Goku's combat ability. The guy trained! And, I mean, TRAINED. He got freaking swole, not to mention his fighting skill. There is just no chance he would lose to Touma in a 1v1 battle using physical strength.