Striker

At close quarters a fist is just as good as anything.

Storm Fist

You harness electrical energy in your fists, gaining the following benefits.
    Starting at 3rd level, when you make an unarmed strike, your fists deal 1d4 bludgeoning damage instead of 1 in addition to 1d6 lightning damage. Also, your unarmed strikes benefit from your Rage Damage bonus.
    Amplify. Once per short rest, when you hit an unarmed strike during your rage, you can deal an additional 2d6 lightning damage. If you apply this to a critical hit, the target must make a Constitution saving throw or gain vulnerability to lightning damage for a minute (this vulnerability does not apply to the attack that generated it).

Juggernaut

Starting at 6th level, you are an unstoppable force of nature. You gain the following benefits when not incapacitated:
       If you move 15 feet forward and make an unarmed strike immediately after, your attack deals 1d6 bludgeoning damage and 1d8 lightning damage.
       You gain advantage on Strength(Athletics) checks contesting a shove or grapple.
       If you kill an enemy with an unarmed strike, you gain temporary hit points equal to your Constitution modifier.

Fist of Havoc

Starting at 10th level, you gain the ability to channel lightning directly from your soul. When you enter a rage, you can choose to activate this ability twice per long rest. when you do so, you gain the following benefits:

Your body overflows with electricity, granting resistance to lightning and thunder damage.
Your unarmed strikes automatically benefit from the Amplify effect without expending the ability.
    As an action, you can slam the ground where you stand, creating a massive shockwave. When you do so, lightning ripples through the ground. All creatures within 10 feet of you must make a Constitution Saving Throw (DC 8 + your proficiency bonus + your Strength modifier) or take 2d8 lightning damage.
    

This lasts until your rage ends or you draw a weapon.

Unstoppable

Starting at 14th level, Electricity flows in your blood, granting the following benefits:
    Aftershock. When you use your slam attack in Fist of Havoc, any creatures who fail their Saving Throw take the damage again at the start of their next 2 turns.
    Momentum Transfer. When you kill an enemy with your unarmed strike immediately after moving 15 feet forward, you gain one use of Amplify. If you already had a use of Amplify, you gain an extra charge which disappears after a short or long rest. Extra charges do not stack.
    Overload. Your lightning damage ignores resistances and treats immunities as resistances.