>>149446242Saki was influenced by the evil Dragon God. I don't know why that had to amount to him being a dickass warlord in every life, or why that necessitated him falling in love through his human avatar with one of his children (Kitsune). With that connection removed, Saki is supposedly reverted to the personality of the mostly nice little boy that great up with Hamato Yoshi in their past life.
Karai, on the other hand, was just ambitious and headstrong, at first, then she had an evil sword, which she lost, and then Bludgeon said she's got evil in her or something, and then she went back to the Evil Cave where she got the Evil Sword and an Evil Dragon hopped in her body and constantly tells and forces her to do Evil stuff, because that's the cost of learning special ninja magic, I guess