Cinna

Everyone loves Cinna. You all know that. So I'm just going to say a few reasons I thought one day, "Wow, Cinna is really great." (Spoilers for the Hunger Games Trilogy.)
Cinna isn't like the rest of the Capitol. He's almost like a person from District Twelve. He's really normal, for lack of a better word. He even understood Katniss's thoughts when she was thinking about how horrible the Capitol is for trying to make her look all pretty while they send her off to her death. I think he genuinely understood what she meant, not just knew, but understood.
Of course he's also a great designer. When Katniss describes the dresses Cinna makes, can't you always see how pretty they are in your head? Gorgeous. The first interview dress in Hunger Games, though. Beautiful. The candlelight dress? That pink one she wore to the dinner in District Eleven? I could die.
Then Cinna has a rebellious side too. He designed those clothes for Katniss to lead the rebellion before his death, before there even was a big rebellion. He made Katniss a Mockingjay dress and risked his life to do that, and that eventually got him killed. He was probably even in on the plan to get Katniss out of the Quell alive. He was the designer of the rebellion. Cinna, you are so cool.