More Nether Structures And Mobs

More structures would be an amazing addition to the nether, and improving the current structures would also be pretty cool. While the nether does have a good personality, i feel like it could be more expressive of the anger and hellishness of itself. I also think new mobs and minibosses could be cool. Example: some sort of fire piranhas. They attack when a player is submerged in or near a lava lake. A miniboss would be like a wither skeleton brute that lurks in some sort of hidden nether dungeon.