Things to know before proceeding: My headcannons may clash with yours. Examination of Johanna's back story is here, usually through heavy introspection by the character herself. However said backstory isn't told as a cohesive unit, details are dropped when I feel they're relevant. I own none of the characters, A/N at the end.

Johanna slept on the left side of the bed. Even before they started sharing one she noticed that Johanna slept as far on the edge as possible. She would curl into a ball and drift over until she was practically falling off the bed during their stint as roommates in 13, and Katniss would spend half the night waiting to hear the thunk of her landing on the floor. It never actually happened but her worry never lessened; when they started sharing a bed it increased. Johanna turned out the be partial to the little spoon position and while she didn't make a big deal out of it to avoid further embarrassing her blushing-furiously-because-she-was-supposed-to-be-tough girlfriend she was secretly thrilled. Except every night she would wake up, plastered against her girlfriend's back, hand (and usually a foot) dangling over the side of the bed due to the fact that Johanna had inched over and she had followed the heat. And every morning she would wake up in the center of an empty bed, her positioning on her back telling her she had been pushed there instead of moving under her own power. She finally confronted Johanna about it, asking why she always went left instead of staying in the center when they fell asleep every night. She half expected a shrug and "I don't know" as Johanna never seemed to monitor her habits too closely. Instead her girlfriend took a deep breath and muttered "I prefer to sleep on my stomach and since I'm right handed it's easier to grab a weapon off the bedside table on a roll off the bed."

Katniss thought that over for a moment, noting that she used to stick to the right because she always slept curled up on her side and it was easy to grab the bow from that position. Except she hadn't slept like that since they moved in together, and pointed out that they didn't actually keep weapons on the bedside table anymore. Johanna smirked. "Yeah. You fixed my need to. If it really bothers you I'm sure you could fix this too."

0o0o0

Johanna's hands were always either holding something or itching to. Her axes were her comfort item during the Quell, and she had been too drugged to really show the habit at first in 13. But there were moments in the arena where she would be relaxed enough to start shredding leaves instead, or shifting sand through her fingers and Katniss learned that during her absence the bag of pine needles had hardly left Johanna's grip. It was an endearing habit, in theory at least, as it gave Johanna an almost childlike quality and led to talented fingers that knew how to handle everything they touched. But when they moved in together it made her want to hit her lover with the nearest heavy object. Nothing was safe from Johanna's touch. She picked at the flowers, the knick-knacks, the pictures, anything that wasn't bolted down. It drove her crazy because Johanna would absentmindedly pick something up, wander around while fiddling with it, and put it down in a completely different place in the house. She couldn't find anything.

"Would you stop it?"
Johanna looked down at her empty hands then up at Katniss and the sandwich she had just been holding. "Stop what?"
"This was my lunch. So why are you walking up the stairs picking at it and leaving breadcrumbs everywhere? Fucking hell Johanna. You are impossible."
"Sorry. . ." Johanna looked almost hurt. Dammit. She didn't mean to sound pissed but she could not take it anymore. She needed to know that something in their house would stay where she left it.
"Just. . . you gotta stop moving shit around. We'll buy you something to take everywhere so you don't have to do it with everything we own."
A grin crossed Johanna's face. "We don't have to." She reached out and grabbed Katniss's free hand, winding there fingers together. "See? Done."

0o0o0

Johanna hated nicknames, something Katniss leaned through Finnick. Right after their reunion during the Quell, when Finnick had finished unceremoniously dumping Johanna in the water and Johanna had stopped screaming curses at her, Finnick had teasingly called her Jo and ruffled her hair. In return he had gotten a swift and powerful knee to the crotch.

In 13 her dependence on morphling became concerning enough to pull him out of his blissful bubble with Annie, and he started calling her Jo. She swung an arm halfheartedly the first time, and he kept it up till she was herself enough to tackle him over the table during lunch one day.

Before they left for the Capitol, Katniss had been down the hospital corridor to look in on Peeta one last time. As she passed by Johanna's room she heard the hated nickname come out of Finnick's mouth once more and peered in to see her hand wrap around his bicep hard enough to leave a bruise that he would carry for the first couple days of their mission.

When they first started dating she kept Finnick's unfortunate experiences in mind and made sure not to use any shortened version of Johanna's name. Pet names were okay (although not in front of people, something she learned when Johanna ignored her for half a day after she called her Baby in front of Haymitch) but she wasn't secure enough in their relationship to risk nick names. She didn't understand why Johanna hated them, just knew that her reactions were violent when they were used. She wanted to ask, but more than that she wanted the privilege of using them. She knew Johanna loved her, knew that she was the only person left that Johanna truly cared about, but she wanted more. Wanted Johanna's love to give her the ability to call her Jo, because Hannah and Anna didn't fit her girlfriend at all. It was an odd desire, but Katniss figured it stemmed from being unwilling to really share everything with Peeta and Gale whom she had assumed to love. She wanted to share everything with Johanna, including awful nick-names, because she didn't want boundaries the person she actually loved.

She finally caved to that desire a year into their relationship, hoping that she would get nonchalant acceptance of the nickname. Instead she got a flicker of hurt in Johanna's eyes and a subdued response. There was no violent reaction, no anger, instead it was worse. She was suddenly living with someone who would respond but not engage, someone who she could feel watching her but would never look her in the eyes. It was ridiculous. Her girlfriend shut down because of a fucking nickname. What the hell.

She finally confronted her about it, when the second breakfast in a row was a silent affair as Johanna refused to look up from her food and refused to stop shoveling it in her mouth so Katniss could start a conversation. "Fuck. I'm sorry okay! I'm sorry I used a nickname! I didn't know it was such a huge crime that you would start ignoring me because I took five letters out of your name. I'm fucking sorry okay?" She got up, suddenly not in the mood to deal with Johanna's shit, but as she passed by Johanna's hand grasped her wrist as she met her eyes and tilted her head towards the living room.

Katniss followed silently as they sat down on the couch, cross legged and facing each other. Johanna steepeled her fingers under her chin and gazed at the floor. They was a moment of silence.

"He called me that. Snow. The first time we met he greeted me as Johanna Mason, then in the next sentence asked – without really asking, ya know? – if he could call me Jo. Then he threatened me and what was left of my family because I had turned out to be harder to deal with than expected and wasn't willing to sell myself like Finnick did. My little brother called me that too, never used my full name at all. Snow killed him first and sent me a condolence letter addressed to Jo. Before the games I used Jo, after I became Johanna Mason, victor of District 7. I liked the idea of being that, someone who was a victor, who didn't let anyone control her, who had no weaknesses anymore. Jo died with my brother and every time someone uses it I'm reminded of him and how I basically killed him."
Katniss crawled into Johanna's lap and wrapped her arms around her neck. With her head buried in Johanna's chest she asked "Did Finnick know?"
"No. He only knew I hated it, never why."
"Am I the only one? To know why?"
"Yeah."
She pulled back to look Johanna in the eye. "I'm sorry."
Johanna chewed her lip. "That's the thing. It hurt when you said it – it always does – but it also felt a little bit like when he used to say it. There was some good. I was trying to reconcile that. And I think I might be ready to start being called that again. Not right away, but slowly. Only by you though."
Katniss considered her girlfriend for a moment. Grasping her chin she leaned her forehead against Johanna's and rubbed their noses together. "I love you Jo."

A/N : That last one fucked with cannon in the beginning. Ah well.

This will be a continuous work in progress, I'll add chapters irregularly and with great gaps as I build more headcannons about Johanna's little quirks and put together enough of them to constitute a chapter (probably like 3-5). Feel free to suggest headcannons/ideas in reviews, more content for this is always welcome (Don't make me beg).