Why did Ada in the Resident Evil series come back after dying in Resident Evil 2?

The deaths just don't make any sense. Are there any explanations for the bizarre events? (Ada died in two different cutscenes, both different ends, and returned in RE6!) (Steve died in Code Veronica but returned in the Dark side Chronicles!)
Best Answer
Steve died in RE Code Veronica X for sure, but The dark side chronicles is more like a remake or a spin-off of the game; same bosses, same places, etc.
Ada did not die in RE2, as far as I remember after she gets hit I think from William Birkin in that trolley, Leon helps her to rest and goes out to kill one of the most irritating RE bosses ever
P.S.: In Resident Evil Code Veronica X ending, Wesker said "Maybe he'll come back alive just as I did, and to see your sister again". I really wish this become true!
Pictures about "Why did Ada in the Resident Evil series come back after dying in Resident Evil 2?"



How did Ada survive the fall in Resident Evil 2?
She survives an accidental T-virus leak, escapes and realizes her feelings for Leon, deciding to quit the spy business and return to him. Canonically, the characters' story arcs are continued differently, as Ada keeps the pendant with the G-virus and resumes her activities as a spy.Does Leon meets Ada again?
Leon and Ada don't meet again until Leon is on his way for a nearby island in his continued rescue of Ashley, the President's daughter. Ada is sitting and waiting in a docked boat when Leon emerges through the door.What happened to Ada Wong?
Despite Leon's belief to otherwise, Ada is presumed dead by Alice until she is reunited with the surviving team as they try to depart from the facility. She is used as bait to lure Barry Burton out of hiding; Barry surrendered under the threat and was gunned down after successfully killing One.How old is Ada in RE2 remake?
9 Ada Wong Ada is playable in both RE2 and RE4 but doesn't become a true protagonist until Resident Evil 6. As a result, she's one of the oldest protagonists in the series history at 39-years-old.What Happened To Ada Wong After The Fall? (Full Story) RE2 Remake To The Umbrella Chronicles
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: cottonbro, Mitja Juraja, Lennart Wittstock, cottonbro