Well, Characters are a semi-ongoing process.
For example, there are archetypes in the Trek universe that can be toyed with.
In my own fan comic I'm making, there's a Klingon serving aboard 'my' ship.
When I came up with his character, he was a security officer- naturally.
As time went on, I realized I'd love to see a Klingon in a different station.
So eventually he became a pilot, and chief conn officer.
Captain: "Can you pull off this maneuver?"
K'rux: "If not I will die a warrior's death!"
Captain: "Lets avoid the dying part for now, yeah?"
I'm not sure how helpful that is. But I'm getting at two things.
One, it's a process. Nobody strikes gold with a character right away.
Even the best characters in Star Trek evolved over time.
Secondly, a function can define a character. A Klingon pilot
An Andorian chief of security
. These stations can tell you something about the character. And it'll give you a canvas to fill in as the story goes on.