[@Lyla] Eh, my aim is not to make them "super OP" or anything of the sorts, though it is rather easy to see why it would look like that. I'll probably back off of the idea now (not just "for now"), since i don't want to press anything too far (since i understand your concerns about it all), but just to try to explain the idea and how the power plays into it:

My original idea was a character who speaks a "magical language" that affects or influences the world around them. They were born the child of a pair of wizards in Nakha who decided "hey, our kids could be fun to do  magical experiment on" and used their research on verbal magic to forcibly implant their child with a magical language that does this. Said child would have been raised as a tool, taught to use this "new language" to enact various effects in an attempt to re-create the "original magical language" or otherwise to simple try to create a powerful magical language other wizards can use with this kid as "test subject #1". 

Said kid is treated as an experiment and toll through life, until being one day tossed to the side for not being as powerful as the wizards and parents wanted, only to be picked up by Mr. Zeph himself or a higher-up minon of his or the like. Treated like an actual human being at this point (though likely still just a tool), she lives with him and is different from the other OC's by at first being on the side of the "bad guy" whom she somehow has gained a positive outlook on. She uses her powers to help keep a fire running for the boiler on her adoptive father's airship running (or something of the sort to be of use to him and Zeph's cause) and eventually decides to seek for the artifact when her adoptive mother or such falls ill (or something of the sort), leading to her being connected to the others. 

This as a result presents an all-new set of challenges for her, between her powers draining her physically each time she speaks, to being unable to speak in the normal tongue as a side effect of he magical language implanted into her, to being a "freak" of sorts among normal magic users giving her a lot of challenges to face along the way through the story. That and her power is both strong in ways, but comes with the risk of making her useless in a heartbeat if she tries to do very large effects or exerts herself too much, forcing her to learn to pace herself and learn to use her power in the little ways that count rather than trying to be "look at me i am summoning a thunderstorm to cloud the skies" or something all of the time by any means. 

That's the sort of gist of what i wanted for her originally. That, and her power would be more "cast a simple fireball or lightning bolt here and there using the language" among the group in a magical sense while also playing support for allies in a sense by affecting the environment around her (like summoning thunderstorms) while at the same time being at the risk of passing out from the strain of her powers on her physical body if she tries to do to much or does too much magic in a period of time. Hence, she would be physically silent outside of trying to communicate with the others in her mind through writing or images or such things.