A tanky, hard hitting version of the Monk.  They love playing tricks only to run away laughing hard, or just breaking though armor like its not even there (when they can).  Monks of the Way of the Problem Child are usually late teenagers and dont have a monastery or anything like that.  They act much more like Fighters and Barbarians than your typical Monk.

Level 3: Strong Guy

When you take this Subclass at level 3, you have advantage on Athletics checks for making Jumps.  You also deal an extra Martial Die of damage to objects.

Level 3: There and Gone!

At level 3, when you use the Disengage Ability from the 'Step of the Wind' Monk Ability, you instead do not provoke attacks of opportunities for that round. (Note: this means the Sentinel feat and other such abilities do not work if you use this ability)

Level 6: Tough Guy

At level 6, as a Reaction to being hit by an attack, you may spend a number of Ki points up to 1/3 your Monk Level (Rounded Down) to reduce your damage taken by a number of d8 equal to the number of Ki Points spent in this way.

Level 11: Breaking Limits (And Walls)

At level 11, as an action and by spending at least 4 Ki Points, you may hit a barrier with such force (Str Check) that you may just shatter it.  If you spend 6 Ki Points or more, you gain Advantage.  For every additional Ki Point you spend after 6, you get a +1 to the check.  This move can work on almost any barrier, including, but not limited to, a Stone Wall, a Iron Door, a Wall of Fire, or even a Wall of Force.  The DC is up to the DM, but should be no more than 30 under almost any circumstances.  You cannot break more than a total of 15ft in any one dimension. (no more than 15ft forward, to either side, or upwards, not even if you don't use your full length on another dimension)

Level 17: THE SOLUTION IS PUNCHING!

When you make an attack with your Martial Arts (fist only), you may spend any number of Ki points before you make the attack roll, up to 1/2 your monk level (Rounded Down).  If the attack hits, you deal a number of extra Martial Dice of damage equal to the number of Ki points spent for the use of this ability.