Affinities
Seifer +60
Spoiler
Rosalia's first friend, having met him during the year-long time skip between Season 2 and Season 3. Her family gave him a place to stay as he ran away from home, and as payment, she has been staying with him in his house in Rijuku while attending school there. However, after it just being the two of them, she has started to find him more and more as a friend, perhaps a brother. Seifer recently had gotten her a violin as a gift, and asked that one day she would play a song for him, a thought that brought a lot of happiness to her.
Of course, she would find out just what that special warmth meant soon enough. After the first day of the Cardfight club, they had gone home and she practiced her new violin with Seifer listening in. This warmth soon brought them to go on what would be their first date, as after eating dinner at a seafood restaurant and on their way to get ice cream, they didn't have to verbally confess. Simply, they held hands, and new from there that the feeling was mutual. So yes, ladies and gents, Seifer is Rosalia's love interest. Thank you for noticing.
Tsubasa +3
Spoiler
The first friend through Seifer that Rosalia had met, Tsubasa visiting the house she and Seifer share the first day they moved into Rijuku. She hasn't fought him yet, but has seen the Gold Paladin player fight, and was the first person outside of Seifer that she had come to think of as a friend.
Neo +8
Spoiler
The second friend through Seifer that Rosalia met, visiting with Tsubasa during the first day she and Seifer moved in. However, Neo had helped her out of the forest and away from potentially mean people, and invited her to his house for a fight and to talk. The fight ended in Rosalia's favor, but as one of the first fights she's had that wasn't against Seifer, it was a good start to a friendship. He also hung out recently with her and Seifer at their house, and though they didn't do too much, simply hanging out was a nice thing to do as growing friends.
Haruka +1
Spoiler
Rosalia only met Haruka briefly. She was led along a detour into an alley by Seifer when there was a commotion at a coffee shop, and was at least introduced to more of her housemate's friends.
Hana +1
Spoiler
Much like Haruka, Rosalia only met Hana briefly, though Hana was clearly into teasing her and Seifer about being a couple from the start. She hasn't really talked to Hana much since then, except to say hi in the shopping district.
Sky +2
Spoiler
At first, Rosalia didn't like Sky. She had met him in the dry cleaners, and after his fight against Seifer, Sky was yelling at her housemate, clearly disappointed with the way Seifer had seemed bored during their fight. She of course was in her housemate's defense, and planned to avoid him. Yet, she met him in the park after her first day of school, and had gotten to know him a bit better. He wasn't nearly as rude as she thought, and after Rosalia won their cardfight, Sky earned a new place of respect and a friend in her.
Noel +3
Spoiler
Rosalia and Noel didn't start off on the right foot. Rosalia had spotted Noel seeming to stalk Seifer in the park, and challenged Noel to a fight to keep the girl away from her housemate. However, it was Rosalia's first fight outside of fighting Seifer, and it was also her first lost. But, after Seifer cleared up that Noel was his sister, she decided that perhaps they could get along if they tried, giving Noel a second chance. After all, Rosalia had potentially found her first true rival in cardfight. Rosalia did catch up briefly with Noel in the park a few days later, but given that there were other people around, they didn't have a fight. Plus, Rosalia had some business to take care of elsewhere, but she did inform Noel about the Cardfight Club, and hoped that she would join it if Noel was enrolled in Hoshiko High.
Satoshi +4
Spoiler
Met in the park after meeting up with Seifer, Rosalia learned that Satoshi was another of Seifer's friends from the past. But he was nice nonetheless, and paid for their ice cream after the first day of school. He also mentioned that her deck, Pale Moon, would probably fit her even without fighting. Now Rosalia wonders what deck Satoshi uses at all, and how their first fight may end up.
While in the park again after comforting Seifer, Satoshi joined them briefly. He was reversed, but seemed otherwise in control of himself, and even caring of them.
Darren +10
Spoiler
Rosalia had first met him briefly in the park, mostly due to the fact Noel had just finished cardfighting him. A stranger for the most part, but if he was friends with Noel, he couldn't be all too terrible. He seemed nice enough anyways at first glance. The following day, they met again in the park after school, and had a cardfight. It ended with Rosalia winning, but both enjoyed the fight immensely, and she also helped him find Card Capital afterwards. Guess her first guess that he was nice was right after all, and now she made a new friend.
Come the Reverse Arc, however, she discovered that he was reversed just as she was. Perhaps they have more in common after all, and he offered to help her get over her fears and doubt from when she was reversed.
Khudus +1
Spoiler
Met briefly in the Cardfight Club the day before the camping trip, Rosalia learned that Khudus is a long time friend (or it seems so) of Noel. She wonders what Khudus uses as a deck, but is glad that he helps look after Noel because of some strange medical condition she has.
Yugure +17
Spoiler
Apparently Yugure and Rosalia hadn't met much in the times before the Reverse invasion, but when the invaders attacked, Rosalia was glad Yugure was around. She even kept her promise to return the mysterious Luquier Reverse when borrowing it to examine the invader's power, even at the cost of injuring herself in the process. With all the havoc going on now, perhaps Rosalia learned she can trust Yugure, and call her a true friend. But, given the whole ordeal with Seifer dying and all, Rosalia realized she felt more for Yugure than she thought, officially naming Yugure as "Onee-chan".