In Star Trek: The Next Generation, there were two slightly similar "warrior" characters - Tasha Yar and Worf. Eventually, Worf moved into be the head of security and took on the kind of "tough guy" role, which seems like a natural progression from how he was established in series 1.
However this was only possible because Denise left / Tasha died. Have the writers/creators spoken about how both characters might have progressed had she stayed for the long haul? Although Tasha's role as the fighter was rarely demonstrated, it's clear that this was what was intended for her, and it's unusual for an ensemble TV show such as this to have two characters so similar without one of them ending up a little redundant.
(I know we got a taste of Tasha's maturing in Yesterday's Enterprise but this time it was without Worf, so the question remains)