Well since people have been asking about the zukizuma siblings crest, I decided to show you just to be 100 percent sure. It was my friend who came up with them before I even started the story, so don't take credit for them at all. Besides the crests meaning although. 

This is Ryuhei's. It is supposed to be a flame. This is also not the right color. Ryuhei crest is red-orange colors. 

And this is Chihori's, who well looks like a star. Her crest color is silver like color.  Hope you like them and can imagine that