Mixing a perojative term like SJW with an agenda but then giving examples of at least more realistic representation of various characters is asking for trouble.
Going from point to point of what you asked, from least important to more important:
-LGBT+ representation: a series like KH that downplays any romantic aspect to a minimum, barely inexistent for the most part except for the almost metaphorical relantioship between Sora and Kairi (10 games in and hasn't been completetly estiblished) and that never covers sex life/day-to-day life, does not need to incorporate any proper LGBT representation because there is no representation of love and proper attraction, period. I rather have no representation than a queer-coded character based on tiresome stereotypes. The only thing I can think of is if Disney makes a really important character officially queer, KH would have to decide how they want to portray that specific character.
- Women representation: KH have never been particulary good about deeping its characters in general, and having only 5 female characters excluding UX, means there is even less deep representation of women. 3 of the female characters are actually plot devices, 1 is a villain and only Aqua gets a proper representation or more rounded personality. Aqua in BbS was a good example on how to do it: not overly sexualized (thanks to disney) so it is not a tokken for straight male entertainement and is as strong if not stronger than most of its pears in terms of personality and power. She doesn't fall to the damsel in distress category and neither Terra nor Ven discover by the end of the game that they are actually stronger than her nor are the true hero os the story. KH3 downplays Aqua's role for Sora to be the main protagonist, but at least she just gets a downgrade similar to Riku and don't fall in the same trope for the third time or is practically omited like Kairi and Namine (even tho I still belive Kairi's portrayal in KH3/RM is a step in the good direction). I do hope the so-called SJW influence KH in this regards. KHs needs more female characters to start with and those characters need to have proper individual storylines and agency. Not all need to be figthers, but lets stop them from only being kidnapped/kill or only move forward becuase of the boys.
- POC representation: there is none in the series and it makes no sense. Sure, Nomura might not be comfortable drawing outside of his regular characters, but it makes no sense that to this day KH (as most animated media) still doesn't put more diversity in their character design. All KH character has veeery similar face features and are clearly white people, with somewhat the exception of Xehanort and Eraqus that feels a little mixed-race. Disney does have a good catalog of movies and shows with clear ethnic diversity, yet KH omits twice the Jungle Book, will never use Lilo from because Japan doesnt like her, will never use Pocahoontas and for good reasons... The only worlds that had some diversity were Land of Dragons and San fransokyo, because the films themseves were diverse. I do hope TPATF and Moana will get representation in future titles, but that doesnt excuse all main characters to be essentially the same appearance.
In general, better representation is nothing but good to any kind of media. A good representation of diverse characters and storylines, including various ethnicies and genders (and it is fantasy! they can actually make their own species!) not only expands your universe, gives you a lot to play with but also allows the consumer, in this case the player, new possibilities to feel attached to this characters as they can potentially feel themselves in that universe. I don't care if this comes from a corporative perspective of "looking woke". If the media children and adults alike are consuming does improve the representation of diversity in the world, that only can help normalizing our view of our world. And if it is good for the company, it is a win-win situation.