I watched a lot of Code Geass when it was shiny and new, but I'll admit that I didn't fall thoroughly in love with it until a few years later.
One of the things I loved most about the series was the anti-hero hero Lelouch who did some horrible things --but for good reason! The darkness of Suzaku and the changes in him reached out and grabbed my heart. A lot of the characters were deep and dynamic and moving.
Though, I will admit I probably wouldn't have become as attached if CLAMP hadn't done the original character designs.
The reason I will continue to specify that it is Code Geass: Lelouch of the Rebellion that I am talking about is that the various spin-offs have different subtitles.
In Love With His War (Suzaku Kururugi/Euphemia li Britannia; Suzaku Kururugi/Lelouch vi Britannia) Suzaku is a street kid doing anything to make his life a little easier. One day, the daughter of a powerful businessman finds him and takes him in. He lived and worked for her for three months before he found out she was the sister of his childhood friend, but his patron dies a month later and Suzaku is kidnapped by a mysterious cloaked man. What will his abductor do with him, who is the Earl of Pudding, and what of the mysterious gray-clocked Toudou from Suzaku's past?