I...honestly would kind of like it if Ako and Tomoe were not blood related.
I don't mean making them not siblings. But show that you can be siblings without sharing parents. Make half/step/adopted siblings valid.
My own brother is a half brother, if you want to be technically correct. But he is 100% my brother, and my dad's child. We love him to bits and I wish there was more of this dynamic in series (the only ones I ever see are "I fell in love with my sibling but it's OK because we're not actually related!" :/)
Feel free to ignore this post.