I have a nasty suspicion that Karlach's under represented story is because of her late addition to the game. Yes she was in EA but the other Origins had years and plenty of feedback to be fine tuned and reworked. Not to mention how early her story can end due to Wyll. Hopefully patches will arrive enabling us to give our girl a slightly better ending than what we have now.
The five EA origins seem to have gotten more love and content than the rest.
Remember the human (This is a forum for a video game):