Id rather NOT use something that will share my personal details with questionable institutions, but deepseek won't remember anything I typed in my current session (and for the libs out there, no, I don't care if China has my personal details; it's not China that can and might use my personal details against me).
Id hate to craft a whole setting in shadowrun only to have to do it again next time. I've been working in Qatar for over a decade and wanted to craft a Qatar-based game (for which by the way, deepseek has gone above and beyond in crafting a shadowrun Qatar; they know about the local traditional attire and suggested shadowrun items themed around them without prompting, and locales they rewrote to reflect a shadowrun aesthetic, and it's calling the underground hacktivist resistance 'silk ghosts' (it does a silk road thing throughout)). I only suggested robots occupy most jobs and it crafted a Qatar where robots are 70% of the workforce while the locals are either execs or destitute, and the (in real life nationally owned) energy and oil company are now privately owned by 'Sustainitech'.
After this impressive world building all I can think is I really don't want craft all this from scratch every time.
For a local chatbot I guess you could download Ollama and then the various models via Ollama on your system (it has DeepSeek and Qwen). Ollama will run the models locally. Then you can use either Chatbox or Msty to serve as a front-end for your llm models. Msty has something called 'Knowledge Stacks' where you can do things like load your core rulebooks and maybe pdfs or epubs of other stories you want inspiration from into a database that your llm models can reference across different conversations. Chatbox has something called Knowledge Bases that can allegedly do the same thing but I could not get that to work.