A martial archetype based on ticking-off your opponent.

Try This Time

Upon taking on this Martial Archetype, when an opponent within 30 feet misses you with an attack, you can use your Reaction to taunt them with the fact. They make a Wisdom save vs 8 + your Proficiency Modifier + your Charisma Modifier, or count as Stunned for the round.  

Blind Rage

By 7th level, as a Bonus Action, target any opponent who can hear or see you with a barb, insult, or similar provocation. They must make a Wisdom save versus a difficulty equal to 8 + your Proficiency Modifier + your Charisma Modifier, or count as having the Blind Condition until the end of your next turn. This effect can be used a number of times equal to your proficiency modifier, per short rest.

$!@#-Eating Grin 

Through a combination of barbs and that ever-present, rage-inducing smile, you cause opponents to falter as they try to attack you. Overcome by the desire to do you bodily harm, they overextend themselves. From 10th level onward, as an Action, you can target an opponent who can see or hear you within 30 feet. If their next action is not an attack against you, they gain a level of Exhaustion. Targets who are immune to being Charmed are immune to this effect. You can use this effect three times per short rest, or you can expend Inspiration to use this effect.  

Claim

Once you have achieved 15th level, if an attack you make kills an opponent or causes that opponent to drop to 0 hp, you can take your Reaction to tea-bag them, urinate on them, or take some other similarly humiliating action. This effect works like Blind Rage, except that it targets all opponents who can see or hear you within 30 feet, and it is not limited in its number of uses.

Schadenfreude

By 18th level, when you successfully use one of the other features of this Archetype, you regain a use of Second Wind. Schadenfreude can be used twice per short rest.

I would change Claim to:

Keep it annoying

As a reaction or bonus action you can taunt any opponents within 30 feet of you. During this time you can make one attack at advantage, not take an attack of opportunity, or impose disadvantage on one opponent until the start of your next turn or until they make three or more attacks against one person besides you. When you gain this feature you have three uses of it. It increases to four at 15 and 5 at 19 

Did you mean Claim? That's more like some of the other features. Although a range limitation and scaling uses seems to make sense. 

I would recommend upping the save DC against its abilities. Most save DCs are 8+Prof+(One of the Ability Score Modifiers). The battlemaster fighter uses either Strength or Dexterity (player's choice) and the Eldritch Knight uses Intelligence for its spell save DC. For this subclass I would maybe recommend using Charisma (so DC=8+Prof+Cha). If you decide to go that route I would recommend finding other ways to mix the fighter's charisma modifier into other abilities so building a high Cha fighter could work. 

for $!@#-Eating Grin, I feel like one level of Exhaustion is too powerful for something that is done as a bonus action and does not give the target a chance to save. A suggestion I have which would work into my earlier one would be "If the target of this feature does not make an attack against you on its following turn, it takes psychic damage equal to your Charisma modifier and is aware that your barbs are causing it." Psychic damage is great whenever you can get it because it is rarely resisted and plays into the fact that your taunts are causing mental anguish. Just an idea though.

In any case I wouldn't have Exhaustion be the detriment due to this ability because it is such a powerful debuff on its own. It could maybe work if you added text saying that "a creature could not gain more than one level of Exhaustion from this feature" but even then I would at least give them a saving throw. 

You suck bbeg, im saying this on a different plane of existence!

I did short the check there. Easily fixed.

Directly causing damage doesn't make sense for me, since this isn't supernatural. Exhaustion is potent for PCs, but for monsters it doesn't come up much in combat. If it needs to be replaced, I' d rather replace it with something that relates to making rash choices or limiting options.

I see what you are saying. I would still argue it should somehow be replaced. To me, becoming physically exhausted because you decided not to attack someone who it taunting you doesn't make a ton of sense to me. 

Thinking of possible alternatives, you could make the effect something similar to the Cavalier fighter or Ancestral Guardian barbarian, where once you start taunting the enemy they have disadvantage on all attacks made against creatures other than you. This could be flavored as they are so distracted by your barbs that they cannot focus on making attacks since part of their mind is still focused on you. 

OR you could have it have a similar effect to the sanctuary spell. The creature targeted by your barbs must make a Wisdom saving throw every time they try to attack a creature other than you. On a failed save, they must instead attack you if possible or lose the attack. This would be another way that your save DC and Charisma modifier get used. 

OR if you wanted something similar to the exhaustion mechanic, how about this: "The targeted creature gains a penalty to all of its attack rolls, ability checks, and saving throws equal to your Charisma modifier. This effect persists until the creature makes an attack roll targeting you. The creature gains the penalty again whenever it finishes a turn without targeting you with an attack." Or something like that. For this effect maybe also state that the creature you target is marked for 1 minute or something. 

In any case, I do not think that exhaustion fits thematically here. 

On a separate note, I agree exhaustion is a mechanic I would like to see used more in 5e mechanics; however, most examples of uses thus far take time before it takes effect. For example, the Berserker Barbarian only gains exhaustion after they have finished raging (which could be a full minute or more). Also, you can gain exhaustion from weather effects but only after each hour of travel. 

My thinking was that they have to forcibly stop themselves, but yeah, it's too quick. You have several other good ideas there. I'll have to mull them over.

One other idea I just had if you wanted to use Exhaustion. Have the ability work such that when you target a creature with it, it sends them into effectively a barbarian rage. In that state the enemy gains certain benefits (advantage on str checks and saving throws, maybe a +1 to melee damage, etc) but when the rage finishes, that enemy gains a level of exhaustion. The rage could end early if they do not attack you at all on their turn. Thus a "smart" enemy will attack you as much as possible to retain their benefits and put off the exhaustions penalty for as long as possible. 

On another note, I like the Blind Rage feature, but I feel like it should also be limited use. Maybe a number of uses equal to your proficiency bonus so it scales with level. I think being able to blind an opponent as a bonus action is better than a spell. Still a super flavorful and great ability in my opinion, just needs a little more restriction.