Excluding characters from JoJo's Bizarre Adventure, is there anyone or anything in fiction that can overcome Giorno Giovana/Gold Experience Requiem? How? I don't read the manga but was just wondering if there exists a hax power/ability more powerful?
Powers & Abilities
Nullification of Cause and Effect: Gold Experience Requiem's ability is to turn anything, including his opponent's attack and willpower, back to the state of "zero". Hence, it is near invincible, as all "supposed" actions created by an opponent would have been reset (back to point zero). It is mentioned by Giorno himself that he is unsure of the exact workings and limits of Requiem's powers, but it has been shown that its range of influence extends from finger beams, surface contact, and to even being in the mere attention of Requiem.
Requiem's abilities is seen by some fans to be opposite of King Crimson's: King Crimson erases the "cause" and keeps the "effect" (i.e time where a bullet would hit him is erased, causing the bullet to warp past him), while Requiem keeps the "cause" but erases the "effect", causing endless scenarios where actions and initiatives are started, but the effects of such does not occur (as shown when Requiem completely halted King Crimson's cause erasing ability).
If the opponent is "killed" by the stand itself, then they will also continuously experience death, as they will die but repeatedly return to point "zero" (i.e Diavolo's endless death loops).
This ability renders Giorno essentially untouchable by anything that would try to hurt him and is perhaps the strongest defense in the series.
Life Giver: Gold Experience is capable of changing inorganic objects into living organisms. A pen can be turned into a snake, a bullet into a beetle and so on. Giorno frequently produces small life forms (frogs, snakes, flies) and plants which he apparently has control over. When any of these are attacked indiscriminately, the creation will not be harmed, and instead the attacker receives the amount of pain they would have inflicted.
Life Shot: Gold Experience's ability can also be applied to living individuals, causing their thought processes to greatly accelerate. This was employed in battles to cause enemies to lose temporal coordination of their bodies (the body cannot catch up with the mind). This also increases and amplifies the reception of the senses in one's body. For example, any pain that is felt would seem to last longer than usual due to the heightened senses. The move might be inherited from The World, because Gold Experience can slow down time in people's bodies.
Transformation: Later on, Giorno developed (or discovered) Gold Experience's ability to produce organic components of the body (e.g. transforming bullets stuck in someone's body into the very blood vessels and organs they destroyed) - evidently, these transformations are permanent. Giorno discovers this new ability after having his throat and foot "cubed" off by Baby Face's ability. Giorno subsequently takes up the healer role of the party. Unlike Josuke, however, Giorno can also heal himself. As it was not originally designed for healing, the process is quite painful.
High Potential Versatility: One of its most distinguishing features throughout the series is its extremely high Development Potential characteristic, with its life and nature related abilities showing little to no limit over its usage and descriptions only scratching the surface of what it can do. While many other Stands throughout the series have shown their own amazing usage and ability via tandem of acuity of wit and skill of a user with their Stand's powers and rules, Giorno has shown a wide application of Gold Experience's vast expanse of ability, be it to accelerate the growth of other floral life, use trees and other flora to entangle and capture opponents, or even reverse transform his creations in disguise to ambush opponents.