Baldur's Gate 3

Late game they also feed you a bunch of strong gith fighter specific gear. Which is a bummer because I respecced her into a Tavern Brawler monk and she just shreds through shit like that. But, like Shadowheart, her story is so central to the plot, so she gets a ton of support and development. Gale is also pretty closely linked to the main plot, but Astarion and Wyll sort of aren't. Karlach is but I think her rewrite trimmed out on content (unless I'm missing something major in the last like 3 quests I have left in Act 3, which is possible).

I'd say that in terms of importance to the overall story, it's Tav, then Lae'zel, then Shadowheart. Lae'zel just has key story elements in every act that are personal to her, be it mind flayer or githyanki specific business. Shart's Act 3 is a little less central, but she's essentially the star of Act 2.

All that's a long way of saying, she has an interesting arc and a lot of race specific gear support to help her shine mechanically. More people need you give her a chance, even in good playthroughs, if they haven't already. I had her benched all act 1 as a very good paladin, then added her when we got to the creche stuff and never looked back.