Kitty: She'd...debate between Itachi and Tyki. After all she is living with Itachi now, but Tyki is ooover a lot. Of course asking Tyki would be like ANOTHER commitment. She'd probably bring it up with Tyki first and feel him out. After all, Road will probably demand Tyki (or Allen).
Euphie: She'd ask Nunnally or Lelouch.
Sam: Dean of course.
Yuuri: He awkward faces forever at this right now. He might choose his Mom to keep her from living with weird people and so that he doesn't have to think about how Josh is gone, Wolfram hates him, and Conrad probably wants to choose someone else.