Cheat Code #4 for accommodating disabled characters in sci-fi/fantasy:
If you want to show a character's personality in the aids they use, you need to add customization, accessories, and/or specializations.
i.e.: You'll have a more three-dimensional character design if you take the time to consider what you can make unique about an aid; it should be as much a part of your design thoughts as the clothes they wear or the hairstyle they keep, and there are several ways to go about it. For example:
Customization would be things like colors and lights. A prosthetic arm can have colored guards that slide in and latch; a rich person might have those guards gilded, while a scientist might have a whiteboard arm panel to scribble notes on, and a stage performer could have theirs painted black with a bone on it to give the appearance of a skeletal window. A visor that replaces vision could have a screen that shows expressive pixel eyes for a happy-go-lucky hacker, or a practical black shield for someone in strict uniform.
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To customize: make yourself a base, then take that base and imagine what each character you apply it to would WANT it to look like; prioritize aesthetics or practicality based on their personal preference.
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Accessories are add-ons to your aid, rather than part of it. A cane could have ribbons wound around it if it's used by a magical girl, or a secret compartment stopper to hide notes in for a paranoid detective. A wheelchair might come with paragliding wings that open with a pullstring for a daredevil, canvas bags full of tools for a mechanic, or hubcaps that detach and can be thrown as weapons for a soldier.
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For accessories, you're not necessarily thinking of "what can I add to this aid to make it special?" The process is better defined as "what would they want to have, and how can I merge the two in a way that's easy to use?"
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Specializations are sort of a deeper combination of the two above features. They're a more advanced way of making your aids stand out, down to the materials they're comprised of or their intrinsic properties, that uniquely suit your character. They're typically hard to come by without being specially made, and can't be quickly modded in.
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A spine brace being made of magic, living wood that grows to fill gaps when damaged would be available to a wood elf, and probably specially given to a warrior who WOULD damage it. A wheelchair made of magic-resistant metal could have use for a battlemage that can't turn to deflect spells quickly, or a witch hunter who wants immunity from the mages they're hunting. A cane that lights up when it senses radiation would be useful to a planetary explorer or warp drive mechanic, but not to a marine xenobiologist studying the starwhale population, who instead has a whalecall whistle built into theirs.
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A specialized aid takes into account not only your character's wants and needs, but also their profession, their common risks, and occasionally their class—especially if you're using rare materials.
When you want to design an aid to be unique to your character, go through this checklist:
What do they want it to look like?
What would they want to add to it, and how do I make it convenient?
What would their setting offer them for their job or status?
What modifications would they have to seek out themselves, and would/could they?
Ask yourself these, and you're well on your way to making your disabled characters as varied as your abled ones.
Cheat code 1: How to avoid eliminating disability in your setting
Cheat Code 2: What kinds of aid to use to accommodate disability
Cheat Code 3: How to make your setting itself disability-friendly
