A normal human on all accounts when it comes to height and obvious features. That is if not taking the dark purple hair into consideration. The few dark roots hint that it might be dyed. That hairdo is kept in a slightly punkish style, with an uneven, longer fringe hanging down to their shoulder length. Upon a quick glance to face height, their androgynous appearance can be noticed as well. The same can be said about their slender body.
Usually one to sit in a corner or keep to themselves, Bastian is often hiding their hands inside pockets or the like, as they examine the surroundings. They are soft spoken and calm when not provoked otherwise.