filler things 

Shadowy Vurtuoso

Starting when you choose this tradition at 3rd level, you gain proficiency in 2 skills of your choice from: acrobatics, deception, investigation, perception, performance, persuasion, sleight of hand and stealth. You gain expertise in one skill or tool. You gain proficiency with disguise kit, poisoner's kit and thieves tools. You gain proficiency with the blowgun, hand crossbow, longbow and whip.
Longbows are usable as monk weapons for you. 

Masked Menace

Starting when you choose this tradition at 3rd level, due to your intense focus and dedication to your training, can channel your ki to duplicate the effects of certain spells. As an action, you can cast comprehend languages, disguise self, or illusory script without consuming a spellslot or ki point. As an action, you can spend 2 ki points to cast darkness, darkvision, pass without trace, or silence, without providing material components. Additionally, you gain the minor illusion cantrip if you don’t already know it.

 

In addition, you excell at reading and your foes' movements in combat. When you chose this subclass, choose either exploit weakness, sudden strike or unrelenting hunter.

Exploit Weakness

Once per turn, if you have at least one ki point unspent you can use your bonus action in preparation for your next attack. You gain advantage on attack rolls this turn and can deal extra damage to one creature you hit with the next Attack this turn. The Attack must use a ranged weapon you are proficient with, a monk weapon or be an unarmed strike, you must be wearing only light armor or be unarmored, and you must not be wielding a shield. The amount of extra damage equals a number of d6s equal to half your monk level (rounded down).

Sudden Strike

Once per turn, when you hit a creature you can deal extra damage. The Attack must use a ranged weapon you are proficient with, a monk weapon or be an unarmed strike, you must be wearing no armor and not wielding a shield. The amount of extra damage equals a number of d8s equal to half your monk level (rounded up). The creature must make a dexterity saving throw against your ki save dc (8 + your proficiency bonus + your wisdom modifier). On a successful save the creature takes half damage from this attack, including the sudden strike damage, the weapon's normal damage, or any other damage your attack would have caused (such as sneak attack, maneuvers, divine smite, blade-trip spell, etc).

You may use sudden strike more than once per turn by spending ki points: 1 ki point for the 2nd use, 2 ki for the 3rd use, 4 ki for the 4th use.

If you take levels in another class, your sudden strike is usable only if you have at least 1 ki point unspent and you may only use it up to twice in a turn, with the 2nd use costs 2 ki points.

 

Beginning at 11th level, if a creature that succeeds its dexterity save from your sudden strike has a feature that allows it to take no damage on success, such as evasion, it takes one quarter damage (25%), rounded down, instead of no damage.

Unrelenting Hunter

As a bonus action, you can spend 1 ki point to cast hunter's mark. When you cast this spell you may spend additional ki to maintain your concentration for longer: 1 to concentrate up to 8 hours, 2 to concentrate up to 24 hours. When you cast this spell you may also double the total ki cost to not require concentration for the duration: 2 ki for 1 hour, 4 ki for 8 hours, 6 ki for 24 hours.

Six Pointed Star

Starting when you choose this tradition at 3rd level, you have begun to focus your training in one aspect of shinobi-no-mono. When you chose this subclass, choose to be initiated in either Wind, Fire, Water, Earth, Mind, or Soul. As an Initiate in your chosen dedication you can channel your ki to duplicate the effects of certain spells or spell-like abilities.

1. Wind Initiate

As a reaction, you can spend 1 ki point to cast feather fall without providing material components. As a bonus action you can spend one ki point to use Ghost Step. Additionally, you gain the message cantrip if you don’t already know it. At 6th level you can spend 1 ki point to use Ghost Strike.

Ghost Step. As a bonus action you can spend 1 ki point to become invisible until the beginning of your next turn. 

At 10th level, you can become ethereal when using ghost step instead of becoming invisible.

Ghost Strike.  When you attack with a ranged weapon you are proficient with, a monk weapon, or an unarmed strike, you may spend 1 ki point to infuse the attack with ki power. If the attack hits a corporeal creature, the creature takes necrotic damage equal to 1 roll of your martial arts die. The attack may strike incorporeal and ethereal creatures as if they were corporeal. You may also use this ability to strike foes on the Material Plane normally while ethereal (for example, while using ghost step ability).

2. Fire Initiate

As an action, you can spend 1 ki point to cast faerie fire without providing a material component. As a bonus action you can spend one ki point to use the Blinding Flash spell-like ability. Additionally, you gain the light cantrip if you don’t already know it.

Blinding Flash. As a bonus action you can spend 1 ki point to momentarily burst into flames. Anyone within 20 feet must make a Dexterity save against your ki save dc or be blinded and dazzled for 1 round. Creatures that succeed on the save are dazzled for 1 round, r reducing their next saving throw or attack roll by an amount equal to roll of your martial arts die.

Earth Initiate

As a reaction, you can spend 1 ki point to cast shield. As a bonus action you can spend one ki point to use the One With the Earth spell-like ability. Additionally, you gain the resistance cantrip if you don’t already know it.

Mind Initiate

As an action, you can spend 1 ki point to cast hideous laughter. As a bonus action you can spend one ki point to use the Whispering thoughts spell-like ability. Additionally, you gain the vicious mockery cantrip if you don’t already know it.

Soul Initiate

As an action, you can spend 1 ki point to cast bane. As a bonus action you can spend one ki point to use the Undue Reprieve spell-like ability. Additionally, you gain the spare the dying cantrip if you don’t already know it.

Water Initiate

As an action, you can spend 1 ki point to cast grease, without providing a material component. As a bonus action you can spend one ki point to use the Deceptive Mist spell-like ability. Additionally, you gain the guidance cantrip if you don’t already know it.

Shadow Step

At 6th level, you gain the ability to step from one shadow into another. When you are in dim light or darkness, as a bonus action you can teleport up to 60 feet to an unoccupied space you can see that is also in dim light or darkness. You then have advantage on the first attack you make on a creature within 30 feet before the end of the turn.

Cloak of Shadows

By 11th level, you have learned to become one with the shadows. When you are in an area of dim light or darkness, you can use your action to become invisible. You remain invisible until you make an attack, cast a spell, or are in an area of bright light.

Opportunist

At 17th level, you can exploit a creature’s momentary distraction when it is hit by an attack. Whenever a creature within 5 feet of you is hit by an attack made by a creature other than you, you can use your reaction to make a melee attack against that creature.