Makes me think of the Ewilan series, by French author Pierre Bottero (2003).
It tells the story of a girl (and probably her friend, not sure if it's this story or another one) who can magically make things become real just by thinking them. They go on an adventure in another world where those "wizards" are known and powerful.
The main character, Camille, is able to "Draw" (that's the in-universe name of her powers) what she thinks about. She does go to a parallel world where Draughtsmen are indeed common. Most people can make some Drawings, but then again some others are very, very powerful. Unfortunately,
the ability to Draw was blocked by Ts'Liches, a species of mantis-lizards who are the main enemies for some time.
I particularly remember a moment at the beginning of the first book where the girl is sitting and drawing, and she makes some bullies fall off a bench just by unconsciously thinking about it.
There is a scene in the beginning of the first book where some guys make comments at her and her male friend, she thinks it'd be funny if these morons were to fall off their bench, and they do.
The friend is named something like "Sasha" and becomes some kind of thief in a brotherhood.
Camille's friend is named Salim, and joins the Marchombres' guild. The Marchombres, which roughly translates into Shadewalkers, value freedom more than anything else. They are trained in stealth, martial arts, climbing, and bypassing some of Nature's laws, such as being able to walk in a river with powerful flow or riding the hazes.
As they value freedom, they don't judge what guild members should do with these abilities, and some of them do steal stuff. In-universe, it's a common misconception that a Marchombre is likely to be a thief: in fact, the very first scene introducing a Marchombre has the two characters seeing market shopkeepers clearing their stalls, due to a fellow merchant having had a product stealthily stolen by a Marchombre.
So yeah, it seems it could be the Ewilan series. As of this day the books haven't been translated; the comics were, but they are an awful adaptation of that amazing series.
