Where does the Friar fit into the group?

For a detailed look at each of these characters, simply follow the link provided below to access Gradesaver's summary of the prologue. In the summary, you will find the order (from highest to lowest) or status of each of the pilgrims. I assume that this is what your question refers to as far as "fitting in." Chaucer's pilgrims represent the different rungs of English society. The summary will supply you with this information in order of importance. 

The Friar is wanton and merry, and he is a 'lymytour' by trade (a friar licensed to beg in certain districts). He is extremely well beloved of franklins (landowners) and worthy woman all over the town. He hears confession and gives absolution, and is an excellent beggar, able to earn himself a farthing wherever he went. His name is Huberd.