1. Sun and Moon have that weird twin telepathy thing
2. "You're related?!"
"Uh yeah we're twins..."
"YOU'RE TWINS??!!!!"
3. Very competitive towards one another
4. Moon took after their father while Sun took after their mother
5. Moon's actually a morning person and Sun's actually a night owl
6. During their journey, they often travel together, but not for long since they get on each other's nerves
7. They have very different training styles
Wow twins