Aunt & Uncle- Tooru's aunt and uncle are his guardians. His parents both died in a car crash when he was very young and he was taken in by them.
Sayaka- Tooru spent most of his life thinking Sayaka was his sister because they grew up together. After a long period of time, it was revealed to them that they were only cousins and Sayaka grew into an unhealthy obsession with Tooru, who had acted as he thought the "perfect brother" should (and ended up turning into her ideal "perfect man"). She became obsessed and violent, hurting anyone who would get close to him whether it be harassment via razors in letters or pushing them down staircases to get "away from [her] Tooru." Tooru left home because of this behavior, seeing no way to reason with her. Now deceased due to Kira's influence, but Tooru's under the impression that it was suicide because he would not return her affections.
Friends
Soma Asman Cadart- They got off to a rocky start and Tooru still isn't sure if Soma actually believes that he's a male. Tooru's got a mission with Soma and it's to get Soma to actually learn the human behavior of those who can't blow $5k like it's a dollar in a soda machine. They'll get there someday, but for now... Tooru knows he's a good guy, even if Soma's a spoiled brat.
Ion Fair- Ion and Tooru don't talk a lot, but Tooru likes him enough to consider him a friend, even if most of their time spent together is work-related.
Acquaintances
Rei Hino- Met her on duty for TSABO.
Usagi Tsukino- Met her on duty for TSABO.
Yuzuriha Nekoi- Met her on duty for TSABO.
Kadaj Espere- He doesn't know a lot about Kadaj outside of Kadaj's multiple attempts to kill him for no reason in the past. Yeah, he doesn't really like him, but it's not like they've really talked to each other.
Other
Hiroshi Nakano- Boyfriend. They may have gotten together while Tooru was on the rebound but Hiro doesn't know that and Tooru never thought it was a mistake. They've been together for a little over a year now and love spending time with each other. Hiro even writes songs for Tooru and Tooru thinks it's possibly the most romantic thing ever. Tooru may have a financial situation that Hiro can solve, but he's adamant about making sure that Hiro isn't forced to take responsibility for him. Tooru wants to make sure that Hiro knows that he loves him for him, not for his money.
Harumi Fujiyoshi- His boss and personal wardrobe consultant. Well, he first part is true anyway. The second part Harumi does on her own. Tooru doesn't mind her using him as a model for the costumes she makes because, hey, it's free for him. Free clothes is one less expense to worry about. Heck, sometimes they're even for the right gender. (Not often though.)
Ciel Phantomhive- The brat. Tooru does not like Ciel and would like to see nothing more than Ciel getting a nice kick in the ass. But Tooru would never do it himself because that would be bad. No way he wants to get his scholarship revoked for fighting.
His legion of fanboys/fangirls- Due to Tooru's position at TSABO, Tooru has to crossdress. A lot. This earns him fans of both genders, some of whom would follow him as his own personal guard if necessary. Most of whom he has a well-practiced unapproachable "Queen's smile" to keep at least five feet away at all times.