Most Helpful Girl
Probably The Raven Cycle - a series about a group of young kids (a psychic's daughter, a boy fated to die, a magician, a ghost and a dreamer, though all of this was pretty spoilery without being too precise :P ) trying to find an ancient, sleeping Welsh king to get a wish granted. It's pretty awesome and can be kinda scary and sad and sweet and fun all at the same time.
Recently I've enjoyed a series called All For The Game (usually known as The Foxhole Court). It's about a sports team, the sport is kinda like a mix of hockey and lacrosse, who are the worst team in the country and need to beat the best whilst avoiding the Japanese mafia :P The books are actually free online, I recommend trying them out.
Most Helpful Guy
I loved Game of Thrones. The books. TV show is awful!
By my favorite? My very favorite?
"Pandora Star" and "Judas Unchained," Science Fiction by Peter F. Hamilton.
His follow up series in the same universe was great too, but not as good as those two.