A Father to His Men: When Iroh noticed that his crew's morale was down, he arranged for his Earthbenders to train with Bolin.
Arson, Murder, and Jaywalking: Of a sort. When Bolin is reminiscing about times when someone assumed he needed protection in Chapter 2, they are "Take care of Bolin, Naga!", "Mako, keep your brother safe!" and..."Asami, why did you let him wear paisley?!"
Bi the Way: Should be assumed to apply to at least one of them.
From the Mouths of Babes: When Iroh offers a Bolin a favor in exchange for training with his Earthbenders, he holds his arms out in an "ask of me what you will" manner. Jinora refers to this as a "take me, I'm yours" pose.
Gambit Index: Bolin was sure that Iroh being nice to (and putting the moves on) him was some sort of gambit, though he wasn't sure what Iroh was supposed to be getting out of it.