A fighting Friar Tuck will need a suitable weapon. A scythe blade is an interesting concept.
What kind of role would such a warrior monk have in a story? Would they be part of the hero’s team, an outsider who might on occasion come into contact with the hero? Perhaps the hero’s mentor. Certainly, they would be an interesting substitute to the mentor character having to be a mage or wizard or some such.
If one wanted to be somewhat cliched in their character, they could be at odds with their order or unwilling to accept the orders of their superior.
Umm, maybe I should be thinking of including such a character in a story. Or making them the protagonist in a story? There’s an idea.