Gladiator

Gladiators are warriors who have dedicated themselves to the art of combat for the purpose of entertainment. Nothing joys and excites a gladiator more than the sound of the crowds cheering their name as they fell their opponent in a flashy and stylish manner. 

Roar of the Crowd

When you choose this archetype at 3rd level, the support and cheers of your loyal friends and fans fill you with the power to do superhuman feats. When you make an STR (athletics), a DEX (acrobatics) check, or a weapon attack roll, you may use your reaction to add a bonus to that roll equal to the amount of friendly creatures within 30ft of you (up to a maximum of +5)
You can use this feature an amount of times per day equal to your charisma modifier.

Unarmored Defense

At 3rd level, your skill at stylish and flashy combat has awarded you the ability to bob and weave through incoming blows like an actor in a play performing a fight scene. Your AC becomes 10 + Dex mod + Cha mod while not wearing armor.

Additionally, you may use a bonus action to take the dodge action an amount of times per day equal to your proficiency bonus.

Gladiator's Charisma

Starting at 7th level, Your athletic skills and practice in the art of gladiatorial combat make people more likely to respect and listen to you. You gain proficiency in performance. If you are already proficient in performance then you gain expertise in performance instead. Additionally, you may add your strength or dexterity modifier to any charisma check you make.

Showboating

Starting at 10th level, you have mastered the art of taunting through your career as a gladiator. You can use an action to cause an enemy of your choice within 30ft of you to make a wisdom saving throw (DC = 8 + CHA mod + prof bonus), on a failed save the enemy has disadvantage on attacks against all creatures but you for 1 minute.

You can use this action a number of times per day equal to your charisma mod divided by 2 (rounded up).

For the Fans

Starting at 15th level, you have learned to perform flashier and more effective attacks due to the support of your fans cheering you on. You can now apply your Roar of the Crowds bonus to the damage of attacks. Additionally, when you roll initiative with no more uses of Roar of the Crowd, you regain one use.

Gravitas

Starting at 18th level, your presence on the battlefield becomes a source of inspiration for your friends and fear for your foes. When you reduce a hostile creature to 0 hp all allies within 30ft gain temporary hp equal to double your charisma modifier and all enemies within 30 ft must make a Wisdom save or be frightened for 1 minute or until they succeed the save on subsequent turns.