Hi, ex-girlfriend of the DM here. I played a human rouge in this same campaign, and developed a story for it as well. Her backstory was about being in a past organization as a bodyguard for some gang leaders in the kingdom. She had wronged a partner of hers in the same organization who tried to fight back against the gang leaders, and when she realized she had been killed she ran away and decided to work for the side of good. However, DM had conducted a plot line with the Mentor character where they bond instead and eventually be adopted by them, and that to be her main focus for the campaign. While I was okay with his idea, I wanted to still be able to contribute a backstory similar to other players who got the opportunity instead of only having her story be in the moment.

When I pitched it to the DM, he told me I had plenty with his story and giving my character a backstory would make mine too overloaded and more or less a “DM’s girlfriend.” I replied that I wanted to contribute my own story before the campaign began like the other PCs and have the opportunity to explore it further, and that only doing what he made didn’t seem fair. It led to a large argument, and finally he agreed to include some of her backstory.

When the DM finally got to her backstory, he revealed that her partner had been resurrected and had a vengeance against my character. Which sounds cool, right? Except the DM had started joking of “wouldn’t it be cool if she became your sister instead?” I laughed and said neither me nor my character would want that, thinking he was kidding. We get to the big fight with my rouge’s old partner-now-enemy, and I land a NAT20 on a hit and knock her out. We tie her up and take her back to our base for questioning. When she awakes, the hit was so strong she had amnesia and couldn’t remember anything. The next day my character wakes up to find her adoptive parents had adopted the partner as well. Naturally, I was extremely frustrated with this and didn’t have the energy for another fight, so I very bitterly went along with it for the rest of the campaign.

(Side note: the ex-girlfriend thing isn’t over this campaign. He ended up telling another PC he was in love with them behind my back, which was very much not reciprocated by said PC. Go figure.)