01. Suzaku's gay. Suzaku's very very very gay. He's wildly uncomfortable with this realization and has yet to come out to anyone - he grew up in a very strict, conservative household, and as such he feels he is failing his father and the Kururugi name.
02. His mother died during childbirth, so he never really knew a mother.
03. And now for something completely different: Suzaku rarely wears underwear. DOES THAT SURPRISE YOU. LOOK AT THOSE SUITS. But seriously, when he's in his uniform, there is. Not much room. Why do I think about this.
04. When he was entered into a Britannian foster system after his father's death, he was forced to become an honorary Britannian, and because of his status as a Japanese child, had a very hard time finding a foster home.
05. Suzaku is nearly trilingual - English, Mandarin, and Japanese, though his Japanese is very stilted from so much disuse, and his Mandarin isn't very fantastic.
06. EVERY MORNING, like a good little boy, he does push-ups, sit-ups, and even jogs up and down the stairs sometimes, to keep in shape. He's kind of hapless when he's injured - no clue what to do.
07. Suzaku believes that the only thing he is truly good at is flying his Knightmare.
08. Because of how much he squelches his emotions, he has some severe anger issues. He never really vents or deals with that anger, so it comes out in generally unhealthy ways, usually aimed towards himself.
09. Suzaku feels a kind of protectiveness over Yuffie that he did with Euphy - silly, but it's mostly just because of her name. They're not much alike, other than their optimism, but he's constantly blending the two. As such, he's already "failed" Yuffie by her being killed by Sasha, and he can't live that guilt down.
10. While Lelouch's Geass effectively forced Suzaku's life to be saved, he is also... all the more thoroughly fascinated with death now. He's constantly testing his limits, though he hasn't been able to successfully attempt suicide since he was Geassed.