Yes, the Bnha manga has finished. The final chapters wrapped up the plotlines and brought closure to the series. It's been quite an adventure for fans.
Some powers might need to be toned down. For example, Todoroki's ice and fire powers could cause a lot of damage in the real world. He'd have to learn to control them more precisely so as not to cause destruction. And some powers might be more useful in unexpected ways. Uraraka's zero - gravity power could be used for things like helping with construction or moving heavy objects in a safe way.
They also show the hierarchical structure. The bosses are at the top, making decisions, and the lower - level members have to follow orders without question. In many mafia novels, there are descriptions of how power is maintained and transferred within the organization. Like in 'Gomorrah', we see how new leaders emerge and the old ones are either overthrown or die in the process. This shows the cut - throat nature of the mafia world.
In some BNHA fanfics, Kaminari might be portrayed as the traitor, but it really depends on the specific plot and the writer's creativity. There are various interpretations in the fanfic world.