If this wasn't posted in the Monk section, you might think this thread is about Battlemaster Fighters, Rangers, or Valor Bards (it's not). If you only care about damage this isn't the thread for you... unless you were wondering how to max out the damage of your monk (ew)

Meet Genji (from Overwatch):

3 Ranger (Hunter-Horde Breaker, Close Quarters Shooter) / 17 Monk (Way of the Kensei).
Str-8/Dex-20/Con-16/Int-8/Wis-16/Cha-8 [point buy 8/15/15/8/15/8 + Skirmisher Warforged + 2 ability score improvements (+1 Wisdom, +3 Dexterity)]
Warforged (Skirmisher - using (Unarmored) Darkwood Core)
Darts (reflavoured as Shurikens) as Kensei weapon
Sharpshooter feat.
Dual Wielder (draw two Darts per turn)
Patient Defense or Flurry of Blows or other monk abilities
Hunter's Mark or Longstrider or other ranger spells
Absorb Elements (any time) or Deflect Missiles (only when you have a hand free)
Diamond Soul

Health: 170 (not 200)
Speed: 60
Armor Class: 22
Saving Throws: Str +5 / Dex +11 / Con +9 / Int +5 / Wis +9 / Cha +5 / Death +6 (with Diamond Soul's ability to reroll once with 1 Ki point; it's worth noting that your +9 or greater saves are Dexterity, Constitution, and Wisdom (the most common saves in the game))

Combat (assuming no magic items):

For boss-type enemies: Darts and Flurry of Blows, Sharpshooter, Dual Wielder (2x Darts), Hunter's Mark, Deft Strike, Stunning Strike, Horde Breaker

Part 1--Darts:
Attack modifier: +7: 6 (proficiency) + 5 (Dexterity) + 1 (Close Quarters Shooter) - 5 (Sharpshooter)
Advantage: no advantage, except Unerring Accuracy
Damage: average of 53.5 damage per two Darts per round (without critical hits) for about a minute -- 2x((1d10 (dart with Martial Arts die) + 5 (Dexterity)) + 10 (Sharpshooter) + 1d6 (Hunter's Mark)) + 1d10 (Deft Strike)
Note: You can use Horde Breaker to attack a second enemy within 5-feet of the boss-type enemy (e.g. with an extra Dart (you can only draw 2 per turn)), although you lose any Hunter's Mark damage.

Part 2--Flurry:
Attack modifier: +11: +5 (Dexterity) + 6 (proficiency)
Advantage: no advantage, not even Unerring Accuracy
Damage: average of 28 damage per Flurry per round (without critical hits) for about a minute -- 2x((1d10 (Martial Arts die) + 5 (Dexterity)) + 1d6 (Hunter's Mark))
Stunning strike: you bet! Just keep in mind that Flurry of Blows takes 1 Ki point per turn, Stunning Strike can take 1-2 Ki points per turn, and Deft Strike (not always worth it) is also 1 Ki point.

For other enemies (no unreliable buffs allowed): Sharpshooter, Dual Wielder (2x Darts), Martial Arts bonus attack
Attack modifier [Dart]: +7: 6 (proficiency) + 5 (Dexterity) + 1 (Close Quarters Shooter) - 5 (Sharpshooter)
Attack modifier [Unarmed]: +11: 6 (proficiency) + 5 (Dexterity)
Advantage: Unerring Accuracy (for Darts only)
Damage: average of 51.5 damage per round (without critical hits) -- 2x((1d10 (Dart with Martial Arts die) + 5 (Dexterity)) + 10 (Sharpshooter)) + (1d10 (unarmed Martial Arts die) + 5 (Dexterity))
Note: bonus Horde Breaker attack, if applicable.

Bonus question: What is Genji's Dragonblade? -- Flame-Tongue and Sharpen the Blade (+3).

An important aspect of this class is you can reliably Dodge every turn you have a Ki point (through Patient Defense). This alongside your movement gives you a surprising amount of versatility.

I was originally on a quest for the fabled 6 Paladin / 14 Monk (while attempting to be as heretical to both classes as possible), but settled on this.

As one aside, Hanzo (also from Overwatch) is a Valenar Wood Elf 3 Ranger (Hunter-Colossus Slayer, Close Quarters Shooter) / 17 Monk (Kensei) with Elven Accuracy, Sharpshooter, Warcaster (and, eventually, an Oathbow with +3 Sharpen the Blade).

As another aside, I also learned that a [13/18/20/8/13/8] Barbarian 3/Monk 17 Hill Dwarf with Dwarven Fortitude + Durable feats, Bear Totem, Way of The Long Death seems pretty frightening. The thing just rips you appart with its hands. (Or you could be lame and use shortsword + shield cycling, where you effectively have a shield 50% of the time, since you are using Barbarian AC calculations. I think there is an implication for Flurry of Blows or Martial Arts bonus attack while chasing enemies based on how free item interactions work (you cannot raise your shield).)

I could really discuss Monk builds all day, so I'm just gonna take a bow of silence.