So, Ive been keeping up with the leaks and I guess this game just ignores Mario lore. Spoilers for a major event if you guys actually care about the plot.
Bobby, the Bob-Bomb partner, kills himself to open up a path and save Olivia, the origami girl. Olivia is depressed for like a solid minute but Mario cheers her up with some DK, Samus, and Goomba masks. Not even kidding.
Pretty sure it was established that Bob-Bombs dont die from exploding. In fact, an explosion from a Bob-Bomb is more like a regular person throwing a punch. I guess Bobby would rather be dead than be in a new Paper Mario game.