Older sibling is...debatable. Shadow technically is a teenager in terms of his physicality, and extraordinarily intelligent like herself - they're both pretty much geniuses, but chronologically? Shadow might be younger than Maria. He was created, not necessarily born in the traditional way. But regardless, he is her sibling and she loves him unconditionally and unapologetically. If given the opportunity, she would talk about him for hours on end, and how wonderful he is.

"Izu...ku? Did I say that right?" Another difficult name, that's going to be the norm here, isn't it? "I'm Maria Robotnik, it's a pleasure to meet you. Have you arrived here recently? I don't think I've seen you around very much before today."

Oh, the bow...he must be from the East then! Just like Sakura!!