For more on that: see here.

As Roman Catholics use this term, what are its principal Characteristics?

And from Wikipedia (see footnotes there)

“As used by the Roman Catholic Church, the term evangelical Catholic refers to Roman Catholics in full communion with the Holy See in Rome who exhibit, according to Alister McGrath, the four characteristics of evangelicalism. The first is a strong theological and devotional emphasis on the Christian scriptures.

Secondly, evangelical Catholics stress the life, death, and resurrection of Jesus Christ as the cause of salvation for all mankind. A personal need for interior conversion is the third defining mark, and, consequently, the fourth is a deep commitment to evangelization.

Evangelical Catholics see these evangelical emphases as the core of the 2,000-year tradition of Catholic Christianity. Evangelical preaching movements such as St. Dominic’s, who was called the Vir Evangelicus (evangelical man), are a common point of reference. To Catholics, the term ‘evangelical’ refers to its etymological root—the Greek word euangelion—which means ‘good news’ or ‘Gospel’, not to Protestant Evangelicalism.

To Catholics, being evangelical is understood in the context of the adherence to the dogma and Sacred Tradition of the Catholic Church and in a Catholic interpretation of Scripture, and not in the doctrinal and ecclesiological upheavals of the Protestant Reformation.

Increasingly, the Roman Catholic Church is appropriating the evangelical witness of the recent popes and their encyclicals, especially Pope Paul VI’s Evangelii nuntiandi (On Evangelization in the Modern World), John Paul II’s Redemptoris missio (The Mission of the Redeemer), and the Congregation for the Doctrine of the Faith’s Declaration Dominus Iesus (The Lord Jesus), for which Pope Benedict XVI was primarily responsible, when he was previously Prefect of the Congregation.

New bibles, catechetical materials, youth ministry programs, and young adult ministries witness to greater evangelical zeal within the Church. College campus ministry and parish ministry are focusing more of their resources on outreach (pre-evangelization and evangelization).[45] A Catholic organization called the Evangelical Catholic exists for the purpose of equipping Catholic ministries to be evangelical.[46]

In Greenville, South Carolina, a Catholic organization called the Center for Evangelical Catholicism exists for the purpose of spreading the “New Evangelization” program of the Pontifical Council for Promoting the New Evangelization in Roman Catholic parishes and schools across the United States.

Since the call to evangelization is so integral to the Catholic faith and solidly attested to in the ecumenical councils, the writings of the Church Fathers, and papal teaching, the late well-known Father Richard John Neuhaus (1936-2009), (a former longtime Evangelical Lutheran pastor) looked to the day when the term ‘evangelical Catholic’ would be redundant – when identifying as ‘Catholic’ would imply active evangelization so strongly that the addition of ‘evangelical’ would be unnecessary.[47]

As a group, they are often not disaggregated in social science research, though there have been recent calls to change this.[48]”

— George Weigel’s book Evangelical Catholicism