Okko: The Cycle of Air

My favourite so far.  While Okko is never really the main character, the plot does revolve around him in each of the three volumes.  Since it's told from Tikku's point of view Okko comes across as a larger than life figure but in The Cycle of Air Okko really comes to the foreground to prove that the legend has merit.  Hub is not afraid to show violence and the consequences.  The Cycle of Earth had a warrior with one arm lose the second and here Okko loses an arm as well.  It also fuels speculation as to who Okko is, who his mother is and why Noburo is so devoted to him.