My latest 5E PC for organised play is a wood elf Rog 1/Mnk 2 criminal (spy) in game terms. In concept, she works for a secret elven group as a spy, graduated to be a field agent (learning some very efficient, deadly and non-flashy unarmed combat) and will get her imaginary 'license to kill' at Rog (assassin) 3/(shadow) Mnk 6. But she would never think of herself as a 'monk'. She's never visited a monastery in her life, never uttered the word 'Ommm', and doesn't try to copy an animal when she kicks you in the 'nads.
Well, that is fine if the campaign, in which you are playing. If I am running my campaign setting, the character would not exist with those mechanics. Shadow Monks don't exist in my campaign (actually, the monk class does not exist) and multi-classing is not used (or requires the character to sit out for a long period unless there is sufficient downtime). For a Jason Bourne type character, I would let you have a rogue(assassin). For the martial arts, I'd have you take SkidAce's Martial Arts Feat which grants improved unarmed damage and 2 battlemaster type maneuvers usable unarmed. If you want to fight unarmed, it would be something like the DMG suggestion to give up your armor proficiency for an AC Bonus. I might also suggest one or two other options in addition to or in place of depending upon the campaign that I am running at the time, its cultures, etc.
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