index.js

const API = "https://rickandmortyapi.com/api/character/";
const xhttp = new XMLHttpRequest();

function fetchData(url_api) {
  return new Promise((resolve, reject) => {
    xhttp.open("GET", url_api, true);
    xhttp.send();
    xhttp.onreadystatechange = (event) => {
      if (xhttp.readyState === 4) {
        if (xhttp.status == 200) resolve(JSON.parse(xhttp.responseText));
        else {
          return reject(`ha ocurrido un error inesperado`);
        }
      }
    };
  });
}

Promise.all([fetchData(API)])
  .then((data1) => {
    console.log(`Primer Llamado...`);
    console.log(`'Personajes: ${data1[0].info.count}`);
    return fetchData(`${API}${data1[0].results[0].id}`);
  })
  .then((data2) => {
    console.log(`Segundo Llamado...`);
    console.log(`Primer Personaje: ${data2.name}`);
    return fetchData(data2.origin.url);
  })
  .then((data3) => {
    console.log(`Tercer Llamado...`);
    console.log(`Dimensión: ${data3.dimension}`);
  })
  .catch((message) => console.log(message));