I use ${they}, ${their}, etc. I used to use ${he} and just added ${hers} as a different one but I prefer ${they} because it’s consistent and errors get noticed more easily.
If you have certain verbs that are used a lot, like @LisHz has with the NPC, I’d recommend creating them as well, such as ${say}. This results in way fewer verb agreement errors and is quicker to type!
You might have seen this before but this is the format I use: