What I know:
This was a current-canon comic (so published within the last 7-ish years.) I saw pictures/panels/illustrations from it on Wookieepedia within the last six months (so it might be an especially recent publication) and noted that a character was carrying the Colonial Warrior laser pistol from the original Battlestar Galactica TV show. I've since forgotten who the character was and didn't pay attention to the rest of the article.
What I think:
It was a female character. Possibly a bounty hunter or a smuggler. Possibly a Rebel. Pretty sure it was a human, but I am not fully certain.
What the blaster/laser pistol looks like: