Yes, "Friar" should be capitalized when referring to a specific individual or as part of a title, such as "Friar Tuck" or "Friar John." However, if used generically to refer to any friar in a non-specific way, it would not be capitalized, for example, "the friar at the monastery."
Friar John -The only other Friar who appears in the story 8)
the friar... the friar...
Friar John
Friar
A friar is a male.
He sends a friend and fellow friar, Friar John, with a letter.
Friar Tuck
Friar Laurence asks Friar John to deliver a letter to Romeo explaining the plan to fake Juliet's death.
no, but you do capitalize mum
Friar Lawrence married Romeo and Juliet in his cell.
Romeo asks friar Laurence to marry him and Juliet in secret
Romeo and Friar John are not related. Friar John is a Franciscan friar who was supposed to deliver an important letter from Friar Laurence to Romeo, but he was unable to do so due to being quarantined during a plague outbreak.