In certain comic universes, the Speed Force has faced significant events that could be interpreted as its 'death'. However, comic storylines are complex and can vary greatly.
In certain comic arcs, Barry takes actions that lead to the destruction of the Speed Force. This often has significant consequences for his powers and the superhero universe.
It depends on the specific comic series. Some comics focus heavily on the speed force and mention it often, while others might only touch on it briefly or not at all.
One idea could be Percy Jackson somehow gets connected to the Speed Force. Maybe during a quest, he stumbles upon a portal or an ancient artifact that links him to this powerful force. He could then gain super - speed, but struggle to control it at first. His demigod powers might interact in strange ways with the Speed Force, like his water - based powers could be enhanced when he moves at high speeds, creating some kind of water - speed hybrid attacks.
If Naruto were blessed by the speed force in a fanfic, it would completely change his fighting style. He could quickly close the gap between him and his foes, and his rasengan would be delivered in a blink of an eye. Also, his ability to gather information on the battlefield would be enhanced as he could zip around to different locations rapidly.
Well, Percy's water - based powers could potentially create some really cool interactions. For instance, if he were to run at high speeds using the Speed Force, he could leave behind a trail of water that could be used for various things. Maybe he could solidify it into ice to trip up enemies or create a water shield while moving at super - speed. His ability to control water might also allow him to manipulate the moisture in the air while speeding, creating a sort of fog or mist to conceal his movements.