Rain, Storm, Cloud, Sun, Mist, and Lightning; she influences, understands, and accepts all of them.
Twilight as Tsawada Tsunayoshi aka Tsuna [link] [link]
(Hyper Tsuna) Sky Flame user and the 10th boss of the Vongola Family.
Ok first lets get the diferences out of the way. Before he got involved in the mafia, Tsuna was a loser good for nothing, with horrible organization, with no friends, who sucks at every sport and always gets the lowest grades in his test (I'm sure his highest score is 16/100). And now.... he still all that but his social skills got better and he can probably kick anyone's ass. (and I mean everyone)
So yeah the main difference is the academically performance. But who cares, the are both the main character, they have a few similarities, they both are the most normal of their respective group(In Twiligh's case 2nd), humble, and Tsuna's flame attribute is Harmony.