If you roleplay or do fanfic or write any story—original or some fanfic of an already existing story—the dialogue sounds awful, and that’s true for every AI: ChatGPT, Claude, Grok, etc. Mainly, the dialogue is unbelievably repetitive, and then characters either have an overreaction to something or an underreaction to something. The dialogue sounds truly, truly awful. No one really has a distinct personality; they all sound the same, repeat the same lines, and the dialogue is cringelord-tier. It doesn’t sound like real, actual people talking.
If you’re dealing with an LLM, which you most likely are, the AI will adapt based upon what words and scenarios you use. It can’t readily know what you’re aiming for and what characters you’re using to treat them as individual entities in whatever the RP is. You have to do an awful lot of heavy lifting to get to the point of the AI to grasp what you want out of it.
That’s just how it is.