One Piece and Naruto, great friendship and best skills!
HxH its unique and memorable and funny too.
SwordArtOnline, Accel World, and many more.
Right now i'm seeing Shigatsu wa kimi no uso.
My favorite anime are the following:
Clannad
Grisaia no Kajitsu
White Album 2
Shingek no Kyojin
Akame ga Kill!
Hunter x Hunter (2011)
Cross Ange
Shigatsu wa Kimi no Uso