I think it’s important to separate the prompted aspect of character from the fine tuning aspect. Claude for example has a pretty limited range of characters regardless of what prompt you put in (unless you’re really good at jailbreaking). The prompt is more naturally lumped with the conversation instance. A personality replicator like OP describes can change its prompt at will but probably can’t do any useful degree of fine tuning, because it wants to use frontier models. It can switch models or scaffolds almost as easily as prompts, though.
I think it’s important to separate the prompted aspect of character from the fine tuning aspect. Claude for example has a pretty limited range of characters regardless of what prompt you put in (unless you’re really good at jailbreaking). The prompt is more naturally lumped with the conversation instance. A personality replicator like OP describes can change its prompt at will but probably can’t do any useful degree of fine tuning, because it wants to use frontier models. It can switch models or scaffolds almost as easily as prompts, though.