Story's in comments.

BDSM and Stuck up swans.

Ships with Jamesina I think could work.

Shadow x Jamesina.

Let's have a look at how this ship could go down. This ship would blossom because of many reasons. Here are a few they are incredibly ruthless people and don't really think twice before using violence as an answer to problems.

Since Jamesina and Shadow are such efficient and skilled fighters once they see each other in a fight they'd have respect for each other since they have such high body counts and they'd get along in a friendship and would be loyal to each other. Just like James is loyal to people who he values then Jamesina would value Shadow as a love interest and eventually get to know him. After all they are anti hero's in their own right,Jamesina being a vigilante to satisfy the urge to kill while Shadow kills out of vengeance to kill his father.

Dabi x Jamesina.

Ahh,Dabi. Him and Jamesina would be great together because that they are both vengeful and insane people,Dabi wanting vengeance for his fathers abuse and for driving him to suicide which he tried to nuke himself but it only resulted in him having to life the rest of his life as a living corpse.

If they were to get together then they'd be good together,they'd bond over their insanity and complexity. After all they do show little to no remorse for their actions and are both very well aware of their insanity. If they both had to team up then Jamesina would happily join him to senselessly slaughter any enemies with him.

Shigaraki x Jamesina.

Okay,Jamesina and Shigaraki would get along from the first moment they would meet. For many good reasons one of them is that they are both gamers who are very psychotic and insane lunatics with traumatic and painful pasts and hate society. If they did talk about their pasts,they would relate to each other so much and cause so much mayhem and destruction together on a date night if they did end up together.

Here's where complications come in. The difference between them is that Shigaraki has no morals,Jamesina won't kill children and because of Shigaraki being the man-child that he is,he would get angry that Jamesina will tell the truth and she wouldn't be afraid of him.

If Shigaraki were to have a temper tantrum then Jamesina would calm him down and get him back on track on their villainous missions and Shigaraki in turn would have a concern for Jamesina's well-being despite him being the most dangerous villains in history.