You’re St. Justin Martyr!
You have a positive and hopeful attitude toward the world. You think that nature, history, and even the pagan philosophers were often guided by God in preparation for the Advent of the Christ. You find “seeds of the Word” in unexpected places. You’re patient and willing to explain the faith to unbelievers.
I'm really not sure which of the Fathers would be most Chestertonlike personality wise. Belloc and St. Jerome could easily be pictured together. Chesterton would most likely match best with.....St Justin Martyr? My knowledge of the Fathers isnt quite what it should be. I know controversies, and the names associated with them, but little about personalities beyond the heavies (St. Augustine, St. Basil) There is a certain Eastern-ness to Chesterton which leads me to suspect that he might be most closely mirrored by one of the Greek or Alexandrian writers.
Interesting thought at least.