Here yah go

NPC.kt

package codes.shiftmc.minigame.npc

import net.minestom.server.coordinate.Pos
import net.minestom.server.entity.*
import net.minestom.server.entity.Player.Hand
import net.minestom.server.entity.ai.target.ClosestEntityTarget
import net.minestom.server.entity.metadata.PlayerMeta
import net.minestom.server.event.entity.EntityAttackEvent
import net.minestom.server.event.player.PlayerEntityInteractEvent
import net.minestom.server.instance.Instance
import net.minestom.server.network.packet.server.play.PlayerInfoUpdatePacket

class NPC(
    val name: String,
    val skin: PlayerSkin,
    instance: Instance,
    spawn: Pos,
    enableCape: Boolean = true,
    val onClick: (Player) -> Unit
) : EntityCreature(
    EntityType.PLAYER
) {

    init {
        instance.eventNode().addListener(EntityAttackEvent::class.java) { handle(it) }
        instance.eventNode().addListener(PlayerEntityInteractEvent::class.java) { handle(it) }

        val meta = getEntityMeta() as PlayerMeta
        meta.setNotifyAboutChanges(false)
        meta.isCapeEnabled = enableCape
        meta.isJacketEnabled = false
        meta.isLeftSleeveEnabled = true
        meta.isRightSleeveEnabled = true
        meta.isLeftLegEnabled = true
        meta.isRightLegEnabled = true
        meta.isHatEnabled = true
        meta.setNotifyAboutChanges(true)

        addAIGroup(
            listOf(LookAtPlayerGoal(this)),
            listOf(ClosestEntityTarget(this, 15.0) { it is Player })
        )

        setInstance(instance, spawn)
    }

    override fun updateNewViewer(player: Player) {
        val properties = listOf(
            PlayerInfoUpdatePacket.Property("textures", skin.textures(), skin.signature())
        )
        player.sendPacket(PlayerInfoUpdatePacket(PlayerInfoUpdatePacket.Action.ADD_PLAYER,
            PlayerInfoUpdatePacket.Entry(
                uuid, name, properties, false, 0, GameMode.SURVIVAL, null, null
            )
        ))

        super.updateNewViewer(player)
    }

    private fun handle(event: EntityAttackEvent) {
        if (event.target != this) return
        if (event.entity !is Player) return

        onClick(event.entity as Player)
    }
    private fun handle(event: PlayerEntityInteractEvent) {
        if (event.target != this) return
        if (event.hand != Hand.MAIN) return

        onClick(event.player)
    }
}