So I noticed someone removed the deletion template from this page without any form of official (or viable) defense regarding why it should stay. Idk about the heroes wiki, but Villains wiki explicitly forbids removing a deletion template without a debate on whether the page should stay or go and is punishable by temporary bans (or permanent if it persists). That aside, I'm just going to say to the argument that "she becomes a hero later because she helps save the world of her own volition"....no. She doesn't. Like the other Warriors, their motivations for trying to save the outside world is purely for selfish reasons. It only happens when it is their homes and loved ones are in danger that they decide to join the remaining SC to try and stop the Rumbling. The Warriors, including Gabi, are not absolved of their crimes simply by joining an alliance straight out of a superhero movie. The only reason Reiner Braun qualifies for the Heroes wiki is because the Marley arc is mostly told from his perspective and shows more complex motives behind his horrific crimes. Gabi does not have that same benefit. She debuted as an antagonist, and though she regrettably does not qualify as a villain, she also does not qualify as a hero either. Antagonist doesn't always equal villain, but protagonist =/= hero just because antagonists may have something to gain by siding with heroes.
Edit: Also to add why Gabi doesn't qualify where Falco does...Falco never had any antagonistic qualities, let alone even remotely villainous, and was always portrayed as someone with heroic qualities. Gabi doesn't have those. For most of her role she has been portrayed as a violent and bloodthirsty sadist who wanted to kill Eldians on Paradis. Just because she is now realizing she was brainwashing and helping them stop the Rumbling does not mean she meets the qualifications of being a hero.