I'm stubborn, and I only use characters I genuinely like for the most part. Ineffa is someone I'm more neutral about but she's cute and her kit is basically mandatory for Flins, so I use her as well. I am however not a fan of Sucrose, and I know she is best in slot for Flins, but I will always refuse to use her.
Currently, my team is Flins, Columbina, Ineffa, and Fischl. I have C1R1 Flins and work toward a 4 burst rotation (Full burst and then 3 mini bursts.) The reason I do this is because, while a 3 burst rotation gets more dps, I just really want to see his burst animation. I use Ineffa as a shielder, buffer, and battery of course, and Columbina as a hydro applicator, buffer, and also as a bit of a healer to be more comfortable (I put the Prototype Amber on her.) Fischl is there to be extra battery for Flins to support my playstyle with him, though I will admit, I don't use her super often in my rotations. Another reason Fischl is there though is because I love her, she was my 2nd ever DPS, I adore her character, and her special outfit fits in perfectly with the Lunar Charged color scheme. Which is why I am hesitant to replace her, even if the person would be a better fit for the team.
I have loved Jahoda since the moment I saw her (though I am disappointed her silly animated expressions aren't in any of her idle animations.) I love her personality and her silly glasses, and seeing as you can get her from the new event, I started looking into her kit and if there was anywhere I could use her. It seems the only place I personally could put her is on my Flins team in replace of Fischl.
I do love Jahoda, and I do love Fischl. Jahoda is a better fit for the team (EM buff, healing, minor element application) while Fischl fits the aesthetic leagues better and can battery. I am unsure of how useful Jahoda is as a battery, I have been struggling to find anything about it (which is probably a sign that she can't act as a good battery) so using her would decrease my energy generation for Flins. Is her EM Buff and Healing important enough to disrupt the cohesiveness of my team aesthetic and losing energy generation that supports my 4 burst rotation?