This Notion template includes a suggested design for a user persona. The persona is split into three sections which are also split into sub-sections. Under each sub-section, I have included a description of what to add there.
This template currently includes two user personas, however, you can duplicate them to create as many as your research requires.
It is recommended to create user personas only after data collection and analysis in order to make sure that the personas are backed by research.
Good luck with your user research ♥︎