Representational avatars / profile pictures
This does not fall under the banner of accessibility, but is something that is still relevant to gamers with disabilities, could be quick and easy to implement, and has had some heartfelt requests and votes on console forums.
Representation in this way a nice way to represent the diversity of the audience, and tie in with the wider inclusivity efforts. Even if it was just a wheelchair to start with (a common request), that’s something that could be built on in future. Consultation is key, for example Xbox’ recent avatar exploration work resulted in some significant and useful public feedback on wheelchair design.
Xbox wheelchair avatars, pre wheelchair design feedback
Next: Provide well publicised direct route for accessibility feedback on console functionality