Shonen High

Shonen High (Japanese: 高くジャンプ) is a Japanese anime series that serves as a chibi-style crossover between the various anime series.

The first Season was originally called Shonen Quartet and was a cross between the characters Bleach, One Piece, Fairy Tail and Naruto, however from the second season was renamed Shonen High after adding many other anime to the series.

Plot
One day, a magic button suddenly appears. The protagonists in various anime series all press the button and move to a parallel world, where a new story featuring high school life begins.

Class-1

 * Kakashi Hatake (Homeroom Teacher) (Naruto)
 * Erza Scarlet (Class Rep) (Fairy Tail) 
 * Ichigo Kurosaki (Vice Rep) (Bleach)
 * Nami (second Vice Rep) (One Piece)
 * Rukia Kuchika (Bleach)
 * Orihime Inoue (Bleach)
 * Uryu Ishida (Bleach)
 * Yasutora Cado (Bleach)
 * Monkey D. Luffy (One Piece)
 * Roronoa Zoro (One Piece)
 * Usopp (One Piece)
 * Vinsmoke Sanji (One Piece)
 * Tony Tony Chopper (One Piece)
 * Nico Robin (One Piece)
 * Franky (One Piece)
 * Brook (One Piece)
 * Natsu Dragneel (Fairy Tail)
 * Lucy Heartfilia (Fairy Tail)
 * Happy (Fairy Tail)
 * Gray Fullbuster (Fairy Tail)
 * Wendy Marvell (Fairy Tail)
 * Carla (Fairy Tail)
 * Naruto Uzumaki (Naruto)
 * Sasuke Uchiha (Naruto)
 * Sakura Haruno (Naruto)
 * Sai (Naruto)

Multiverse Unite!
Crossover with Isekai Academy and Kingdom Hearts: Cartoon School's Adventures.