I have plans for many interesting features in future updates.
Elixir is designed to be easier to set up and use than Silly Tavern.
To use Silly Tavern you need to have a descent understanding of how AI Roleplay works to set the parameters, select the best LLM and adapt the character to run flawlessly on that LLM.
In Elixir, I have done all those steps for you and adapted the characters to run perfectly on fluffy/l3-8b-stheno-v3.2 (q4_k_m).
But, there's no way to "explicitly" describe "user Persona" in Elixir. The conversation summary system generates a summary of "user's personality" based on the conversation, and it becomes a part of the character's memory.
In short, how you behave with her (character) and what you tell her about yourself will define your persona for her. That's my current approach towards "user persona".