Booster Gold uses future tech as a hero, the legion time-travels several times, even batman did it in the comics.
However, in each case this is usually done to re-correct the timeline as it should be, because some villain messed it up, also, only the timetravellers themselves remember everything.
Someone here posted the justice league episode, in the second part there is an interesting converstation:
Old Bruce: "Surprised to see me?"
Batman: "I'm surprised I lived this long"
Old Bruce:"Somethings not right, I do not have any recollection of travelling to the future or meeting my future self"
In later DC continuity, JLU batman claims to fully remember the incident, so does Hal Jordan, since they fixed the timeline together by sabataging chronos's timebelt putting it into a continuoous loop and were dropped back into reality. the incident later never happened in Future DCAU, Terry did not die at the hands of the granddaughters of Harley Quinn, and old Bruce lived on to become even older Bruce.
However, both in Marvel and DC, there is at the end of a comic usually a tribute of how the hero fixed the timeline when traveling into the past, be it in the form of a painting or drawing or journal entry by those who he worked with while in the past.
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