Well, if anything's fine with you:
Midori no Hibi
Basically, it is about an extremely strong school delinquent that is admired by one of the students. He thinks it is impossible to find a girlfriend due to the reason that many of the students are afraid of him. However, one morning, he found that the one girl who admires him became his right hand (or stuck on his right hand?)
Fullmetal Alchemist
I believe you have at least heard of this one right? It's about two alchemists which are searching for the Philosopher's stone to recover their broken bodies. They harmed their bodies due to the reason that they tried to revive their dead mother through alchemy. Yes, they are siblings. Many awesome moments here :)
To Love-Ru
Into Romance, Harem, Ecchi? Then this is probably going to suit your taste. Well, to put it short, it is about a boy that encounters an alien girl, and then more and more alien girls started to pop out which will unfold him into a life full of surprises.
Mirai Nikki
Another famous one. The God of Time and Space needs to find his successor, so he decided to throw a game, in which the participants will have their own "Future Diaries" which have the ability to predict the future. They need to eliminate one another (Or kill one another) to win the game and become the next God of Time and Space. The main character here, is supported by a girl who is also a participant of the game, and to avoid spoiling too much, I'll just end it here.
Rabbit Doubt
If you are into mystery or suspense, this is a great one. Doubt revolves around a fictional cell phone game called "Rabbit Doubt", in which the players are rabbits in a colony; one of these players is randomly chosen to act as a wolf infiltrating the group. Each round, the rabbits guess which is the wolf as the rabbits are eaten one-by-one until only the wolf is left.
Four Players of the game decided to gather together. However, they are knocked unconscious and found themselves in an abandoned hospital when they woke up, and they soon realize that they will be playing a the "real" version of Rabbit Doubt, and to survive, they need to find and kill the wolf, or the liar.