NPC...

npc1.php

<?php

/**
 * @name SaveSkin
 * @version 1.0.0
 * @main PJZ9n\SaveSkin\Main
 * @api 3.0.0
 */

declare(strict_types=1);

namespace PJZ9n\SaveSkin {

    use pocketmine\command\Command;
    use pocketmine\command\CommandSender;
    use pocketmine\command\PluginCommand;
    use pocketmine\entity\Entity;
    use pocketmine\entity\Human;
    use pocketmine\event\entity\EntityDamageByEntityEvent;
    use pocketmine\event\entity\EntityDamageEvent;
    use pocketmine\event\Listener;
    use pocketmine\level\Level;
    use pocketmine\nbt\tag\CompoundTag;
    use pocketmine\Player;
    use pocketmine\plugin\PluginBase;

    class Main extends PluginBase implements Listener
    {
        public function onEnable(): void
        {
            $command = new PluginCommand("ss", $this);
            $this->getServer()->getCommandMap()->register($this->getName(), $command);
            $command = new PluginCommand("sc", $this);
            $this->getServer()->getCommandMap()->register($this->getName(), $command);
            $this->getServer()->getPluginManager()->registerEvents($this, $this);

            Entity::registerEntity(NPC::class);
        }

        public function onCommand(CommandSender $sender, Command $command, string $label, array $args): bool
        {
            if (!$sender instanceof Player) {
                return true;
            }
            switch ($label) {
                case "ss":
                    if (!isset($args[0])) {
                        return false;
                    }
                    file_put_contents($this->getDataFolder() . "{$args[0]}.skin", serialize($sender->namedtag->getTag("Skin")));
                    $sender->sendMessage($this->getDataFolder() . "{$args[0]}.skinにセーブしました！");
                    break;
                case "sc":
                    if (!isset($args[0], $args[1])) {
                        return false;
                    }
                    $skinTag = unserialize(file_get_contents($this->getDataFolder() . "{$args[0]}.skin"));
                    $nbt = Entity::createBaseNBT($sender->asVector3(), null, $sender->getYaw(), $sender->getPitch());
                    $nbt->setTag($skinTag);
                    $npc = new NPC($sender->getLevel(), $nbt, $args[1]);
                    $npc->setNameTag("nametag");
                    $npc->setImmobile();
                    $npc->spawnToAll();
                    $sender->sendMessage($this->getDataFolder() . "{$args[0]}.skinを着せたNPCを作りました！");
                    break;
            }
            return true;
        }
    }

    class NPC extends Human
    {
        /** @var string */
        private $message;

        public function __construct(Level $level, CompoundTag $nbt, string $message)
        {
            parent::__construct($level, $nbt);
            $this->message = $message;
        }

        public function move(float $dx, float $dy, float $dz): void
        {
            return;
        }

        public function attack(EntityDamageEvent $source): void
        {
            if (!$source instanceof EntityDamageByEntityEvent) return;
            $entity = $source->getDamager();
            if (!$entity instanceof Player) return;
            $entity->sendMessage($this->message);
            return;
        }
    }
}