Mobs of minecraft

Also, there are many mobs with unique behavior

These have different reactions or they simply exist, and there are generally 3 types: passive, neutral and hostile

For example the undead mobs:
Are hostile? Are neutral? Are passive?
Undead mobs Zoglin YES Non real mobs YES Zombified piglin YES Undead horses YES
Dead "players" and villagers YES Wither-creatures YES

There can be many unknown mobs to people who dont know, but I can resume that: most passive can be bred and wander anywhere, or can be tamed. Neutral are mostly passive but under special conditions (its night time, you hit them, or in the case of the enderman, stare at them...) will attack you. Hostile hate you on sight and will try to hurt you. If you want to know something about every mob, I better recommend you to go to List of all mobs (on another website)this list of all mobs

Also, there are entities, which are NOT mobs but behave like them. I mean, a fired arrow, for example, is not a mob, but still moves, can damage a mob or other entities, and cannot be hurt or broken like a block. Few entities can be hurt or broken like a block, but do not require a tool to do that (bare hands is enough), most entities are "invincible" unless a case happens (for an arrow, it's picked up, for tnt, its life expires, exploding, for a thrown egg/snowball/other, to collide with a block).

full diamond skeleton
full diamond (rarer if enchanted) skeleton, about a 0.04% chance of spawning (rarer even than blue axolotl, pink sheep and other)