Mobs
Despite being unable to attack the player, this passive mob is unable to spawn in Peaceful mode because it is part of the hostile mob cap
Ocelots
This block, added in 1.17, can be used to prevent fall damage and is collected from a Cauldron. However, it did not generate naturally until 1.18
Powdered Snow
This update, Jokingly called the Hoe Update, made it so Hoes could mine Hay Bales and other blocks faster
1.16
This cat variant owned by GoodTimesWithScar won the cat community contest and was added in 1.14. However, it was unable to naturally spawn in villages until 1.16
Jellie
This structure is the only structure that can spawn in two or more dimensions
Ruined Portals
Name Tags can be used to name mobs, such as ShonBom the Chicken. However, this one mob is unable to be named through the use of a Name Tag
Ender Dragon
This enchantment in 1.11 is the only enchantment a compass may receive
Curse of Vanishing
This structure is the only place Mud Bricks, Packed Mud, and block of coal can naturally generate, and it was added in 1.20
Trail Ruins
This achievement was only obtainable in singleplayer mode by throwing a diamond at a zombie to pick it up
Diamonds to you
Most villages will spawn with an Iron Golem in them. However, this village type has a center that is unable to spawn its Golem since it is too short
Taiga Village
Brewing stands allow the player to create potions. If brewing stands did not exist, this mob would be the only way to acquire a potion of invisibility.
Wandering Trader
Lightning can be used to charge Creepers and turn Villagers to Witches. When lightning strikes this mob, it instantly dies and drops 1 bowl
Turdle
This effect, added in 1.9, only impacted fishing and can only be acquired with commands
Luck
While waiting for a Zombified Vilager to cure. these blocks can be placed around them to speed up the process
Iron Bars & Beds
Without breeding sniffers, this is the only way to obtain sniffer eggs
Ocean Ruin
This unused Illager can cast Blindness on the player turn invisible, and create duplicates of itself
Illusioner
Similar to how lava and water can create cobblestone, this block is created when lava flows into a space that is on top of soul soil and next to blue ice.
Basalt
Added in 1.13, the World of Color, this tameable mob will dance when near a Jukebox playing a Music Disc
Parrot
Before 1.21.2, this advancement could be cheated by off-handing a mace and then feeding a parrot a cookie, killing it instantly
Over Overkill
This structure, found exclusively in the overworld can generate in any biome
Stronghold
Teleportation is a form of instantaneous transportation, ignoring commands, pets and portals, this mob only found in the overworld has the ability to teleport.
Fox
Bane of Arthropods deals extra damage and inflicts this status effect to affected mobs (bonus if you get the level right)
Slowness
Major updates add new content to the game. including new items. In 1.18, only this item was added
Otherside (Music Disc)
This neutral mob was required for Monsters Hunted in 1.14
Polar Bear
This structure is the only place where block of lapiz lazuli naturally generates
Woodland Mansion