Since Laby isn't released in EU servers, spoilers should be advised. But oh well, who haven't heard of her anyway.
Feel free to correct me if I'm wrong, but Laby, as base job I mean, isn't typed as a fighter per se. Maybe NA promotional announcement called her a brawler (and imo, they're not wrong, but not quite right either), but I can't say if KR did the same. She does use punches and kicks but she also relies on her mirror (and her own imagination). And as any character as base job, she has all traits that can lead through various paths. Only 1st line path might be considered as a fighter.
It's debatable whenever if Radiant Soul should be or not the canon path. But if you think this way : Eternity Winner just gave up on using her mirror and solely relied on herself. She almost didn't interact with Nisha and she harbors negative feeling towards her mirror. And so until reaching 3rd, because she was considering her mirror as a tool rather than a part of her. From what you know from Laby's epic quests (especially once reaching Elyanod), epic quest-Laby wanted to co-exist with Nisha after learning what Nisha is really.
Then, Eternity Winner definitely can't be the canon path.