The Wise Advisor with Hidden Motives
The Friar acts as Romeo's confidante, just like the Nurse does for Juliet. He represents the older, wiser generation and is highly respected - Lord Capulet calls him "this reverend holy friar" and says the whole city owes him gratitude.
However, beneath his wisdom lies a scheming political mind. His plan and potion ultimately set the wheels of fate in motion. He believes marrying Romeo and Juliet will end the family feud, saying "For this alliance may so happy prove, to turn your households' rancour to pure love."
Despite his good intentions, he's aware of the couple's rushed romance. His warning "Wisely and slow, they stumble that run fast" proves tragically prophetic when his advice about "violent delights have violent ends" foreshadows their doom.
Remember: The Friar questions Romeo about how quickly he's forgotten Rosaline, showing he understands the dangers of hasty decisions.