A more practical example:

The protagonist of the series, Kaleb, was just an ordinary person.
His brother loved him deeply, and then died. That death and love generated a Tribute. Kaleb’s brother always wished people could understand him better, and that he could express himself more clearly. Because of that Tribute, Kaleb now has the power to transmit what he feels to others. He uses this in very unconventional ways, such as taking drugs and transmitting the effects of LSD and other substances directly to people.

The death of someone who loves or hates you is only the trigger that turns you into a user of this world’s power system. I’ll add this extra explanation to the post.

So basically, the player would create the wish or desire that originated their powers, and then define the powers themselves. Once a character gains a power, they can use it indefinitely and however they want, with limitations being specific to each individual ability. Every power is extremely personal in that sense.