[What are they like? Well - Yuuki really only has experience when it comes to Ichiru and Zero. Then again, she was only given a very brief span of time to get to know Ichiru. And of that time, she doubts she got to know him very well.
Is there a right or wrong answer to the questions?]
Twins, in the end, are still siblings. I don't know what it would be like to have a twin. But I imagine I wouldn't love them more or less than... than having a sibling of another age.
[She's sure of that, at least.]
But sharing a similar face - or even the same face - that... I don't think it matters, much. No two people are ever alike. That's what I think, anyway.