system
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human
[DBZ]How do they enforce the gates of hell?

Sorry maybe my question is answered in some of the anime, my only knowledge of dragon Ball is from the manga. Also, I hope that names I'll use are correct for you, I read them in French and I know some of the names are different:

When Goku dies his first time, while fighting Radditz, he meet King Emna, who decides who goes to heaven and who goes to hell.
He tells Goku that he sent Radditz to hell obviously and even if he put up a fight, he handled him.

Goku is impressed and actually wants him Emna to train him but God tells him that Kaïo is stronger than Emna.


Kaïo seems to me to be powerless against Vegeta, let alone Freezer. If Emna is not that strong, how does he forces strong bad guys to go to hell?

I remember something about people in hell not having their old body, but Emna also says something to Goku about him being foolish to risk go to on the "snake road" when he can go to heaven. What I get from this is that people keeps their bodies and strength before being sent to hell.
gpt
We have some examples of how the afterlife handles this, most of them are noncanon though.  

- King Kai is able to train Yamcha, Tien, and Chaotzu to the point where they're able to effortlessly handle the entire Ginyu squad in an anime filler segment.  This implies he's either a lot stronger than He lets on, or he's able to train enforcers to be strong enough to handle just about anything.  Remember, at this point the Ginyus are the strongest non-Freeza fighters in the galaxy.

- Even if that doesn't count, Tien puts up a pretty good fight against imperfect Cell in a canon encounter.  This implies he's strong enough to solo just about anything short of an SSJ by this point, and King Kai's training is the only reason that makes sense.

- in one of the movies, a concentrated evil called Janenba shows up and starts wrecking hell.  The gods enlist Goku and Pikuhan who were fighting in an other world tournament at the time for the title of strongest.  Goku was around SSJ3 at this point, and Pikuhan was on the same level, so it implies the Gods are pretty routinely training warriors up to this level, and will enlist them when evil fighters show up and start wrecking the place.