What she means:
Light Yagami never got to know true love. The only person he might have loved was brutally killed by Rem and he was forced to pretend not to care. He never wanted his father to die. He just wanted to make the world a better place. He sacrificed everything for the good of the world and he never got credit for it.
L: L has a classic sneeze. Everyone always jokes about the “Ah… ahh…. ah..! ACHOO!” type sneeze. That sneeze is the exact type of sneeze that L has. When L sneezes his oh-so famous sneeze, he pulls his forearm up to his nose out of instinct. After he sneezes, L feels the need to go wipe his nose, as it “feels dirty”, even though there’s nothing there. L also has to rescruffle his hair with his hand as it flies everywhere when he sneezes.
Mello: Mello’s sneeze is pretty weird. When he sneezes, the sound that it makes is “Haaapuffumf!”. It sounds like he’s trying to let out a cry of war but got the sniffles during it. When Mello sneezes, his head gets forcefully thrown back and then pushed back down to his chest. Somehow his hair stays perfect. He also flails his arms just before he sneezes. Mello rarely sneezes, but when he does, goddamn is it fun to watch!
Near: Near’s sneeze, similar to his laugh, is high pitched and so innocent and sweet sounding. The noise Near’s sneeze makes is like a kitten sneezing, in which I mean it sounds somewhat like this: “Ch.. Chu!”. Everyone he’s every met has thought that Near’s sneeze is cute as hell. Unlike L, who wipes his nose because he just wants to, Near does because when he sneezes he gets runny noses too. The sight of Near sneezing is one of the cutest and best ones that people have seen yet. Honestly, Near loves his sneeze too.