I believe centaurs would be an amazing add to Minecraft. Why? Well, here ya go, I thought this suggestion was about griffins. Why did you just mention centaurs?
Minecraft already has a good collection of mini-bosses/bosses. The Wither, the Ender Dragon, the Elder Guardian, the Evoker and other mobs depending how far you are in the game. However, there's a small problem with these- The Wither you have to spawn, the Ender Dragon you go to, the Elder Guardian lives in a giant temple, and the Evoker lives in a giant mansion. What's the similarity? You all fight them expecting for a hard fight. And while that isn't a huge problem, I noticed while playing BotW, sometimes it's more fun and challenging to be exploring and then -BOOM-, there's a mini-boss standing right there. I think this feature would be great for Minecraft, so here's what I have:I beg to differ. It wouldn't be very fun if you were playing in the early game and some OP boss showed up, insta killing you. You should be able to prepare and plan for a boss fight. If you were forced to fight a boss without any preparation, bosses would be very annoying for new players. Even later game players could be caught off guard and easily lose all their stuff.
The griffin would look like the attachment below, maybe not exactly, as I don't want it to look too life-like. However, it would sport a pair of wings, some sort of bird head, and some sort of mammal body, being lion or not. Makes sense
The griffin's spawn rate would be like the Woodland Mansion on console edition- 1-3 a world, and in PC and PE, of course it would be separated throughout the infinite terrain. In other words, he won't be lurking behind every corner; instead, lurking behind every ocean/mountain range. They can spawn anywhere in the overworld surface. Even if its super rare, there's still that small chance that a griffin might appear by some unsuspecting player. On the other hand the rarity would frustrate those who want to fight the griffin. Once again, this is when optional bosses come into play.
Other than what's above, there's not really anything else to say about his health except in Hardmode, the Griffin has just as much health as the Wither. This is balanced out by his attacks. That health would put it up with the Ender Dragon and Wither, which just adds to the overpowerdness of naturally spawning bosses. If it was a miniboss like Elder Guardians or Evokers, I might support this.
The griffin has 3 attack methods:
The griffin will, if you are to the left or right of him, will swoop one of his wings down fast, which will create wind current and knocks you back just as much as Knockback II does. This has a range of 5 blocks Easy: 3 (1.5 Hearts) Medium: 7 (3.5 Hearts) Hard: 10 (5 Hearts!) Original and interesting
If you touch the griffin directly like a zombie, you will be issued damage. Easy: 2 (1 Heart) Medium: 3 (1.5 Hearts) Hard: 4 (2 Hearts) Makes sense
The griffin will, if you are to the front or back of him, kick you with one of his legs. This has a range of 3 Blocks. Easy: 4 (2 Hearts) Medium: 8 (4 Hearts) Hard: 10 (5 Hearts!) Wait... so the fantasy half bird doesn't fly. Not saying it should, because that might be OP, but still it doesn't feel right. Again, if it was weaker flight might be balanced...
The griffin will follow you if you try to leave, and is one of the fastest mobs in the game, being 2.3 times faster than the zombie. This will make for a hard escape, as his front and back attacks have a range of 3 hearts. There are really no other huge behavioral things, it will work a lot like a Wither on basic behavior. Ok
The griffin will drop griffin wings, (100% chance for 1 and 5% chance for 2) gold ingots, (1 (100%) - 10 (30%) and a diamond (1 (50%)). Noooo!!! Gold and diamonds are a cheap drop used by those who can't think of any original drops. Leave them as an ore or chest loot. Now lets see about the griffin wings...
Uses For Drops:
Griffin wings are really the only unique item dropped by griffins, and they have two uses:
1. Trade with villagers What's the point of a boss if you can just get wings for a diamond?
2. Make elytra Noooo again! Elytras are naturally generating from End Cities. We don't need another way to get them, let alone craft them.
1. Trading with villagers (carpenters) via griffin wings will give you trades like (1) griffon wing for (5) emeralds or (1) griffon wing for (1) diamond.
2. (PC and PE ONLY) If you collect nine griffon wings, and place them each in their own slot in a crafting table, you will get an elytra fragment (1). If you combine two elytra fragments anywhere on a crafting table, you will get an elytra. You need 18 griffon wings, but no one said this would be easy.
What You Can Do:
-Fill out the poll for the addition of dying elytra fragments, in which you can have two different colors on an full elytra. (An elytra fragment is the left or right half of an elytra) This would be only for an elytra made from griffon wing's, as on the End Ship you just get a full elytra.