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Yes, it is possible to create proxy classes in JavaScript using Proxy. The Proxy object is used to define custom behavior for fundamental operations such as property lookup, assignment, enumeration, function invocation, etc. By using this functionality, we can create a proxy object that can mimic the behavior of a class. Here's an example:

class MyClass {
  constructor(name) {
    this.name = name;
  }

  greet() {
    console.log(`Hello, ${this.name}`);
  }
}

const myClassProxy = new Proxy(MyClass, {
  construct: function(target, args) {
    const [name] = args;
    return new target(name);
  },
  get: function(target, property, receiver) {
    if (property === 'prototype') {
      return target.prototype;
    }
    return MyClass[property];
  }
});

const myInstance = new myClassProxy('World');
myInstance.greet(); // Hello, World

In this example, we create a proxy for MyClass. The construct handler is called when we try to create a new instance of the class. The get handler is called when a property is accessed on the class. In this way, we can create a proxy that behaves like a class.