Both go hand in hand really.
With LLMs + RL Agents, Ellie and Atreus would stop being scripted sidekicks and become adaptive companions who:
(RL) Fight smart and evolve skills. Have muscle memory like moment-to-moment gameplay skills like aiming, dodging, pathfinding, combo timing.
(LLM) Talk naturally, remember choices, interpret the game state, and even help shape the world. As well as tactical brain + reasoning like high-level decision-making, creative problem-solving, adapting skills to context.
I searched all over and the only thing that stops LLMs from running locally when playing a game like RDR2 at 13B parameters is the amount of System Memory or VRAM.
Some interesting videos for you to watch.