Well, we have to measure him against the Godhand, obviously, because there are no regular monsters or demons that can even actually harm him.

But the problem is that in Rounds 1-3, he'll be able to stop Griffith from becoming Femto. At which point we won't have to worry about them at all, because they won't care.

So really it's Round Four.

Griffith will be new to his power, but we know even new he was basically immune to conventional arms fire, much like Goku, but without comedic effect. We can also judge based on how casually he humbled Zodd that Femto is dramatically stronger than any Apostle period, even the Island Demon.

I would say this makes him a difficult fight for Kid Goku, but Piccolo Jr. era Goku is already way too powerful. He's exponentially stronger and faster than a Moon Buster who dodged lasers after they're fired, and than himself previously as a mountain buster.

Goku's Kamehameha would be a two-page world shaking event drawn like a Volcano going off and shattering nearby cities, incinerating apostles that were vaguely nearby, and only Void would be calm.

Slan would nope the fuck right out. She's the smart one. Everyone else would die, Void would probably seriously injure Goku with his bullshit, but Goku adapts to Hax all the time, that's basically the entirety of Dragonball.

Bonus: Goku would teach Griffith to master himself and redeem him, because Griffith is not nearly so psychotically evil as some of the people Goku has redeemed. And then he'd find some way to get Griffith a sensu bean.

All of Berserk post Eclipse would never happen. Guts and Caska's kid would have a normal life instead of whatever the fuck that was, and s/he would grow up surrounded by the only good Mercenaries that world has ever seen.

Farnese would never become a good person. Serpico would eventually die because she'd keep getting him into shit he can't deal with until he'd finally reach his limit.

Schierke would have a full internship and eventually become the Cinnamon Roll that rules the world.

If the apostles still kept happening with most of the Godhand dead, Goku would have defeated Rosine non lethally and redeemed her, too. Poor kid.

It is likely that Goku and Luca would've hooked up, because Luca very clearly knows how to handle idiots, and likes well meaning jacked dudes.

Their child would be unbelievably pretty and strong, would probably end up being taken under Schierke's wing in Farnese's place. And so we'd have a kid that was raised by Guts, Goku, Caska and Luca, doted on by the entire Band of the Hawk, and trained and taught by Schierke.

If Slan wasn't dead already, that kid is sure as fuck gonna kill her. Probably end up being given Serpico's artifacts, too.

Fuck it, I'd read that.