From your other question :
A boy with a troubled past, Grey is naturally a good kid, but has a tendency to violence, and swears to destroy the system of hierarchy that places the strongest at the top of the social food chain, leaving the weak helpless and at the mercy of the higher tiers. He charades as a cripple (though his closest group of friends know about his power, and try to help him with his past), but is actually one of the strongest in his school. His Ability, Aura Manipulation, allows him to detect, manipulate and copy Auras, allowing him to observe the Aura Flow in other power users, copy their Abilities, and combine them in order to produce devastating results (e.g., copying and combining Fire and Wind produces Firenado, not a separate Ability but a combination of the two; some Abilities failed to combine, so not all abilities are compatible). The only limitations so far is that he can copy up to 4 abilities, and he can only use them for a short time period.
Grey has successfully dethroned the Houses (group of "elite" students at a school) of both New Bostin, Southport and Wellington High, and there is seemingly no end to his power. What are some possible nerfs that can be implemented to his power?
These are a few obvious nerfs --
- While Grey can copy Auras, he might not be able to do much about his own Aura Flow (ability strength). He can copy a hellfire, but there might be many people who can throw a stronger hellfire.
- Ohm's Law. If Grey's Aura Flow is fixed, copying and merging abilities might divide Grey's aura flow by the number of abilities Grey is copying. This is like a voltage or current divider in an electrical circuit. So, Grey's Fire+Wind Firenado is half the strength of Grey's Hellfire.
- Aura Manipulation might count towards this total, so Hellfire is at 1:2 strength, and Firenado is at 1:3 strength.
- Power Law. In electronics, $P = I^2 R$. Another optional nerf would be that Grey's time-to-exhaustion goes down exponentially with the # of abilties he's copying. Grey may only be able to use Aura Manipulation + Hellfire for $1:2^2$ = ${1 \over 4}^{th}$ the time of someone who's natural ability is Hellfire alone.
- Skill. Grey is copying abilities that others have been practicing and mastering their whole lives. Yes, Grey can copy Invisibility or Stoneskin, but maybe he's not really good at it, leaving parts visible or exposed to injury.
- Pacing. May turn out that mastering an Ability isn't merely throwing a damaging Hellfire or an impressive Invisibility. People might not even think of it, but over time they are learning endurance and mastering the unexpected skill of pacing their Aura Flow in this way. Grey might also have to master this pacing. And, this art might be as different for each Ability as mastering marathon running is to pacing yourself appropriately for swimming the English Channel, or a Polar Bear endurance competition.