Inverse

It makes attacks targeting him weaker the stronger they are and vise versa

Description

While activated Inverse makes it so all attacks against the user are reversed in terms of damage. Strong blows become weak and weak ones become strong while the technique is activated.
If Inverse's effect were literal, something as weak as air resistance could kill the user while the technique was active. As such, there is a maximum and minimum limit to its conditions.
There are several weaknesses that user may not be able to compensate for. They're at a disadvantage against complicated techniques such as the Limitless. Additionally, the technique can be countered if the user's enemies hit them with a strong attack and a weak one at the same time.