Grappler

Iron Physique
Beginning at 8th level, you can use Dexterity (Acrobatics) check in place of a Strength (Athletics) check when making a grapple check or contesting the check of a creature attempting to escape your grapple. Additionally, your speed is not halved when moving with a grappled creature. Lastly, your maximum HP increases by 3 for every Monk level you possess, and you gain Resistance to slashing, piercing, and bludgeoning damage inflicted by creatures you are grappling.

Master Grappler
Beginning at 13th, your strength and expertise allow you to manipulate your foes as easily as if they were ragdolls in your hands.
 * Elbow Shock: You can spend 1 Ki point to take the Dodge action and make an unarmed strike against a creature you are grappling as a single bonus action. Until the start of your next turn, any attack that misses you while you retain your grapple against that creature hits the grappled creature instead.
 * Fling: You can spend 1 Ki point to move up to half your speed as a bonus action, then throw a creature you are grappling a distance equal to the distance you moved. Then, resolve an unarmed strike against the creature, and any enemy adjacent to it at the end of its forced movement, and the flung creature must make a Dexterity saving throw or fall prone.
 * Intense Takedown: You can spend 1 Ki point as a bonus action while you have a creature grappled to move it to a square adjacent to you and make an unarmed strike against it. Then, that creature must make a Constitution saving throw or be Stunned until the end of your next turn, and enemies adjacent to it must make a Dexterity saving throw or be knocked prone and take damage equal to your unarmed strike damage.
 * Impact Descent: When you fall while you have a creature grappled, you can spend 1 Ki point as a free action in order to force the grappled creature to take your falling damage for you, in addition to any falling damage it would normally take.

Ultimate Diva
Beginning at 18th level, you gain Advantage on grapple checks and checks made against creatures attempting to contest your grapple. Additionally, as a reaction if you have a free hand, you may make a grapple attempt against an enemy within your reach that attempts to attack you in melee. This attempt resolves before the triggering attack deals its damage.