Create a new, using api?

General
3

You should use lifecycles and extensions for this.

Create an extension under ./extensions/users-permissions/models/User.js

Now take a look at the below code:

'use strict';
module.exports = {
   lifecycles: {
    async afterCreate(data, model) {
       //id of the newly created user.
       let userId = data.id; 
       //creating the profile with relation to that user.
       await strapi.services.profile.create({
         ...DataForProfile,
         users_permissions_user: userId
       });
    },
  },
};