Add more unique traits or items, Mobs, structures for individual biomes.

Basically, the biomes right now, they're good but could be better and make the world more fun and atmospheric. For instance, dark oak forests have their unique trait like the woodland mansion, the plains biome not as much so why not add some structures that are unique to the plains or other biomes, like a structure which has a chance to have a sword or any other tool or armor tailored to that structure, they would all have their own perks like one is faster at swinging, the other more damage, etc. And the mobs, while we love zombies and creepers and skeletons, why not add variants like the zombie and skeleton, but for say underground like a miner zombie, the creeper turns into a skeleton creeper or a stone creeper the skeleton is fair game at that point. But best of all is how the biomes feel, when in their vicinity you should know and feel the impact, the sky should change colour, add fog if it's a creepy biome, and may as well add water and temperatures to the game now which has potential, certain mob drops occur in these biomes is another good idea, buffs or debuffs depending on the biome and which dimension. Speaking of dimensions, The End, we need a biome and mob update for that dimension I swear its just plain and boring now, loot is also predictable. And last of all, mini bosses like some from Minecraft Dungeons or Minecraft Storymode,(would also love to see some of that in the base game), the game just needs more vibrancy and customisation and mystery to it.