I was wondering, changelings are able to create personas for themselves.1. it lists they gain a tool proficiency, wouldn’t it make more sense with a skill? 2. How many personas can a changeling have? I know you wrote you had a changeling with about 3-4. #1 is a good thing to bring up on the (upcoming) UA feedback survey.
— Keith Baker (@HellcowKeith) July 29, 2018
Beyond that, there's no real limit, but not every persona grants a mechanical benefit. My changeling Max had 4 everyday personas and a fifth that was never actually revealed during the campaign. I generally limited the skills I used based on my persona, but I didn't get a bonus.
— Keith Baker (@HellcowKeith) July 29, 2018
Those personas should take about as much time to develop as it takes for you to actually learn to use such a tool with proficiency.. Or at least a good fraction of that time. Gaining proficiency with a tool usually takes time money and possibly training. Just changing shape and persona over and over and gaining every tool proficiency out there seems way overpowered and kind of makes it pointless for others to choose background and classes with craftign in mind when a changeling can become any crafter type it wants and will fill every need without the need for training or actual backgrounds.
Either limit the amount of personas to one which would be similar to someone havign a background, and then requier new personas to actually take time and training to perfect.
Developing a persona and picking it up fully with a toolskill should be more involved than just another shapechange.