Ew. Why would anyone want to fight this thing again?
Also, C1ff is right in that the mythological hydra is far more well-known to the general public than the biological hydra, which... has no reason to be in Minecraft.
Remember my "neural network" metaphor? Yeah, it applies here too. This suggestion is super random and overpowered. A hydra is neither a fish nor an octopus. It's a snake. And this mob would be absolutely unrecognizable as a hydra anyway.
Then there's the matter of it duplicating. This is absurdly overpowered. Instead of a real battle, it just duplicates at an absolutely ridiculous rate. (nine additional hydras? per HEART?) And if you defeat it in the one way you can, it just kills you anyway. Why would this mob spit embers when ignited? Nothing else in the game works that way.
This suggestion is extremely unbalanced and random. 20 meters is twice as tall as a Giant, and the distance it can jump looks like your cat stepped on your keyboard to determine it. Ever seen neural networks attempt to create movie titles or recipes? That's what this suggestion looks like; it's nonsensical, has no regard for theme or balance, and looks to have been slapped together out of vaguely suggestion-y parts.
This mob would literally decimate worlds in a fashion that makes very little sense. It's also insanely overpowered (being able to inflict 3 potion effects at once, one of which is Wither) and its drop makes literally no sense whatsoever.
"I already said why I don't like leather armor, and skins color can not be changed by command blocks (for instance in a team game). The ressource pack could be a solution, but I feel like Minecraft should be good by itself."
Your opinion of leather armor is literally irrelevant. It still exists. It fills its role. To complain and suggest an alternative is like refusing dinner because you don't want to eat your broccoli: It's entirely your fault that you're dissatisfied. And since it's not an objective issue but a personal opinion, and since you're absolutely capable of solving it on your own (with resource packs), you should. It's not Minecraft's job to make you a new dinner, to use the metaphor. Take it or make your own.
I don't want specifically to do roleplay, but just that the game looks a little more logical, and that is Minecraft's job !
What would you say if, for instance, in Team Fortess 2, everyone wore blue and red tutus, and the developpers' excuse was "sorry the only dyeable thing we implemented in this game is tutu, so everyone will have to wear tutu now".
I exaggerate the thing, but basically that's it.
Okay, firstly, Team Fortress 2 and Minecraft are totally different games, and therefore any comparisons you make between them are totally and entirely irrelevant. Secondly, it's perfectly logical! Leather armor is a bit bulky because it's armor. And if you're dissatisfied that armor looks like armor, I don't know what to tell you.
Anyway, realism isn't a positive trait. It's a neutral one. It is not Minecraft's job to satisfy you. I repeat: It is not Minecraft's job to satisfy you.
I think the clothes would be at least as much used as the dyed leather armors (knowing that a lot of players uses banners even in singleplayers, and that cosmetics are already popular in the big servers like hypixel).
And I think you literally just made that up in an attempt to change my mind. Your clothing is literally redundant, pointless, and useless. Its purpose is already fulfilled: If you want to customize your appearance, you get a skin. If you want to indicate groups through color, you use leather armor.
Banners are used in singleplayer because, even if it is decorative, they serve a purpose: They allow you to brand constructions and shields with a wide variety of symbols and marks, which is cool. And the use of cosmetics is a different matter: Generally, you also have armor to go with that, in situations where armor is relevant, and I don't see these clothes adding particle effects. There is nothing that they accomplish that cannot be done as well or better with leather armor or skins. Nothing.
It's so pointless it doesn't even have a cosmetic use. I don't see why I should support such a thing.
I still like the idea of being able to wear banners over armor, though.
I mean, I feel that adding banners to armor is a really rad suggestion, but I don't see what use there would be for clothing that couldn't be handled by either leather armor or skins. Or resource packs. Or any combination of the above.
If you want to roleplay in Minecraft, it is not Minecraft's job to accommodate you. Minecraft is not a game that is based around role-playing. It is a sandbox game, and adding clothing items to the game seems staggeringly pointless when more than half of the game's demographic would never use them at all.
The idea of being able to add insignias to your armor is rad, though. Partial support.
Eh... sounds overpowered. Not to mention impossible; Mach 2 is over 600 meters per second, if I remember correctly, and I'm reasonably sure Minecraft wouldn't be able to handle it. Being able to cross almost 40 chunks in one second seems like a bit much for something that costs only pumpkins.
No support. Unicorns could be okay, I guess? Not like this, though.
Yes, you can already play with redstone or smelt. But just because you can already do a couple things doesn't mean we can't have more. By that same logic we shouldn't have brewing, because you can already play with redstone or smelt. Minecraft is basically just a bunch of things you can do, and chass would add to that list. Plus it encourages strategy and taking time to think, which is absent in minecraft today.
And just because something is in a mod or plugin doesn't mean it can't be in the base game.