Ruggie protects Leona from Vil and Deuce when they decide to confront Leona over his failure to tend to the botanical gardens (his punishment for skipping class), refusing to tell them where Leona is.
Leona looks out for Ruggie as well, saying during Fairy Gala that he won’t let anything happen to him. Leona follows through with this promise, distracting fairies that nearly discover Ruggie, Grim and the prefect and giving them enough time to escape.
Leona also protects Ruggie from falling glass in Book 6, and then puts him in charge of Savanaclaw.
Ruggie asks, “Why’d Leona have to put ME in charge?,” and Rook says that it is because Leona has faith in him: “The dorm is his pride—he knows he can trust you with it.” Ruggie responds, “Yeah, well, trust doesn’t fill an empty stomach. There better be some T-bone steaks in it for me later, or it won’t be worth it!”
Ruggie’s protection of Leona can vary according to the situation: during Fairy Gala preparations Ruggie reveals to Vil and the others how they can infiltrate Leona’s locked bedroom.
Twisted Wonderland Reference Note 