Chuunibyo

No one can see the effects of your magic except you. 
You look crazy to everyone else when shouting out all of this nonsense, but the damage is real.

Probably?

Air of Omnipotence

You are the most powerful being in the multiverse. 

Immunity to psychic damage and emotional conditions, including exhaustion. 

Chronocelestial Convergence

You gain the ability to give one mundane item the properties of a weapon. You may change the item modified by expending an action or during a short/long rest. You absolutely must give the modified item a ridiculous name and announce it to everyone within audible range. 

The item modified in this way does (2d4 + CHA modifier) damage. 

Transcendent Improvisation

By the 6th level, you have gained mastery over loudly yelling attack names and distancing yourself from your peers. 

The attack yelled must have an over-the-top name just like the weapon, and does (4d4 + CHA modifier) single target damage of a type of your choosing OR (3d4 + CHA modifier) AOE damage of a type of your choosing. 

You can use this 3 times per short/long rest. (Shared between the two options)

Signature Move

You become attached to one specific move that you absolutely love and will not let go of. 

That move is now your signature move and does double the damage a regular move does. 
(Can only be used on regular Chunnibyo "skills", excludes ultimate attack)

You can use this once per short rest. 

Interdimensional Defence

Your chunni powers have expanded into another dimension. 

If you take fatal damage, your hp is set to 1 instead. 

You can use this once per long rest. (Or expend your inspiration to use this)

Ultimate Attack

Your chunni powers have become so vast that you have taken the time to develop an ultimate attack. 

This attack does (20d10 damage + CHA modifier) to a single target. 

You may use this up to once every three days.