Rhonda

Rhonda is the recruitable character that appears in north factory zone after you saved the mugged guy in chapter 2 and recruited David in chapter 4.The difference between Rhonda and David is she is very very hard to find even after going back and forth to railyard back to North Factory Zone,she still doesnt appear until your luck hits you.So,the wise move is after you recruit her,quickly rush to save before you mess up.