Defender

I'm back, and with a new creation. Clunking through the decrepit corridors of the Stronghold, this hulking mechanical beast was designed to help construct the Strongholds, to carry bricks and excavate the underground. However, when those that built it vanished, the Defenders were left to crumble away, patrolling the hallways and fiercely attacking any intruders.

This is a mob I've designed, called the Defender! It's a powerful, robotic mob that spawns in Strongholds as a sort of penultimate challenge before the player visits the End. It has 3 different textures (normal, cracked, and mossy, like stone bricks) and each body part can vary between those! They carry a block in their back, and each has a different function.
The one shown is the 4th edition of the mob so far, I've had the idea for a while and I recently decided to remake it from scratch, hence this. I'm quite pleased how it turned out, I hope you like it too.

As mentioned earlier, Defenders with different blocks work differently. Defenders with spawners will spawn their mob occasionally, like normal ones do. Ones with chests have a hidden inventory, which drops when killed, and much more that can't be added here while still keeping this concise.
Command block ones are special in that they don't spawn naturally, and must be summoned. They can also be interacted with in creative, and can be given instructions to walk, attack, execute commands, and more.