User blog comment:B214/Volume 23 discussion blog/@comment-31137559-20170410043119/@comment-31137559-20170411050519

DBZ=Only a few bad guys who only the MC(Goku) is strong enough to defeat, world that has to protected by mainly Goku, Vegeta, Gohan, and Piccolo. The others are strong compared to regular humans but lag behind the main ones where they can't do jackshit and are useless compared to the enemies that appear. And they have entirely given up because they realize there is nothing they can do compared to the MC. Goku is the strongest person in the world. Has to pull characters out of the a** with BS powers and abilities to give Goku a challenge.

High School DxD=Power levels are actually relevant here compared to DBZ(although they are still s***). The MC isn't automatically the strongest person in the world. They have plenty of enemies where everyone is able to show their stuff although they're not taking down any big names like the MC. Everyone works together to beat the enemy instead of just one character getting all the attention and being the only competent one who can take down the enemy. There are also other powerhouses besides Issei.