While Katniss is a bow-and-arrow slinging hothead from the beginning to the end, Finnick Odair is a cornucopia of contradictions. He's first introduced as the sugar cube loving scantily clad darling of the Capitol. But once he's in the arena, he quickly proves himself to be an ally and his actions are heroic. He expertly fends off enemies with his trident and saves Peeta's life when he hits a forcefield.
When Finnick's rescued and brought to district 13 he's a distraught that his childhood sweetheart, Annie has been captured and he's a shell of his former self. When she's rescued the two are quickly married and it turns out he's the opposite of the gorgeous womaniser he was presented as. OK, maybe not the exact opposite — he's gorgeous in every iteration — but there are a lot of layers to Finnick Odair. Which leaves me with one question: why isn't he starring in his own spinoff? Oh right, because he's a hero and he sacrificed himself to save Katniss. We never deserved him.