When Suzaku first met Lelouch and Nunally when they were little kids, he was horrified when he found out Nunally was blind. Then he ran away without saying anything more, leaving Lelouch beaten up. Jerk.
Suzaku lied to Euphemia about her plan working.
Euphemia slows them all down and tries to make a change in the world naively. Very naively.
Nunally and Euphemia are both used by Schneizel... Pretty much. They're NAIVE. Suzaku too!
Nunally is selfish in a few things I've read.