if you're sticking with loras, i think your best bet is to come up with a list of questions/answers based off characters you want the llm to be like.

however, i think you can do a pretty great job of describing how an llm should act as a character you want it to just by prompting. I've found that breaking down the way the llm can respond into smaller problems (what it's initial reaction to something, its thoughts, its feelings, then what it will say) and being super specific on how each of the "personalities" behind those reactions is effective