You guys really some it up pretty well when it comes to having no one to talk about the plot QwQ A whole-hearted thank you for the thread! :3
Okay, so for strengths, Josi is pretty perceptive and catches onto things faster than her peers, as well as curious, very open to learn new things! She‘s also very loyal and conscientious when it comes to the team - which is why she‘ll end up becoming its leader one day and certainly tries her best on seeing her tasks through to the end.
Going into her weaknesses; even though she is perceptive, that doesn‘t mean she mentions what she noticed her right away, instead she overthinks a lot, which ends up in her bottling a lot of things up. Also, since she‘s young, she‘s can be naïve & very immature (as it can be seen in chapter 1.3, being a little stubborn towards her best friend), as well as obnoxious sometimes. Same goes for the curiosity, which gets her in all sort of dangerous situations throughout the story.
For the less psychological & more physical part, she doesn‘t have the best stamina (which also has a reason which I won‘t spoil right now), which means that she tires out a lot after fighting and once she gets to use her true power (which has been sealed for the reason of being that powerful), she‘ll drain herself like a broken phone battery within a short amount of time over and over.
Spoiler for what the power actually is, since it won‘t come up until the end of Part II
It‘s none of the 7 basic elements, being fire, water, earth, wind, lightning, light & darkness, but one of 2 unique powers, being the ability to manipulate space - the counterpart being time manipulation
She‘ll learn to open portals and use them to fire energy beams, by overlapping them or create own pocket dimensions, etc.
Since it is that overpowered, she‘ll come to fear her own power and what it is connected to, which is basically the main conflict of Part III and a reason why she‘s gonna go through major changes in Part IV!