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I think it would be too difficult to implement, even at the character generation level, unless we significantly simplify this part. Otherwise, I don't know what the result would be. If all the characters are from our world, then it might be possible. We could make factors like physique, knowledge in certain areas, learning ability/intelligence, and some combat skills important. For example, the second factor would be useful for those who end up in the past, if they happen to be knowledgeable about the history of a specific period. Physique would help them survive in harsh conditions, and combat skills would allow them to learn various combat techniques that are common in that world more quickly. Intelligence would have a similar effect, but related to magic or science. But in any case, it's all complicated and tedious.