According to a recent report, there are at least 17 candidates as possible future Doctors of the Church.
If true, then my favorite candidate on the list is St. Louis Mary de Montfort (1673-1716). In fact, it's said that he's a leading candidate.
One of his writings is called True Devotion to Mary.
He was the one who developed the term "Totus Tuus" ("All Yours" in Latin). Bl. John Paul the Great adopted this phrase for his papal motto.
Having him declared a Doctor of the Church would, I'm sure, have great bearing on a future 5th Marian Dogma of Mary as Co-Redemptrix.
My second favorite on the list is St. Ignatius of Loyola, founder of the Society of Jesus.
One of his writings is called The Spiritual Exercises.
The motto of the Society of Jesus (the Jesuits) is Ad Majorem Dei Gloriam (For the Greater Glory of God), abbreviated as A.M.D.G.
My third favorite is St. Don Bosco because, well, he's a teacher of youth. He's also saints with St. Dominic Savio, a favorite saint of mine since my teenage years.
Not listed below, but I hope to see some day, are saints like St. Faustina (1905-1938), the Secretary of Divine Mercy, and Bl. Edith Stein (1891-1942), a Jewish intellectual who accepted Jesus as the long-awaited for Messiah of Israel, became a Catholic nun, and was later martyred in a Nazi death camp.
Here's a list from the report:
St. Louis Mary Grignion de Montfort (France)
St. Vincent de Paul (France)
St. Thomas of Villanova (Spain)
St. Ignatius of Loyola (Spain)
St. John Bosco (Italy)
Antonino of Florence (Italy)
St. Bernardino of Siena (Italy)
St. Lorenzo Giustiniani (Italy)
St. Cyril and St. Methodius (Slavic)
St. Gregory of Narek (Armenian)
St. Brigit of Sweden (Sweden)
St. Margaret Mary Alacoque (France)
St. Veronica Giuliani (Italy)
St. Hildegard of Bingen
St. Gertrude the Great
Blessed Julian of Norwich
HW: Find out who the current 34 Doctors of the Church are and study their life and teachings.