If you're looking for manga similar to Carnival Phantasm, you might like these titles.
A sloppily worn lab coat, lifeless eyes just like a dead fish's. He's the most un-teacher-like high school teacher, Sakata Ginpachi. The class he's in charge of, 3Z, is filled with 'intensive' students who have created a horrifying amusement park.
Starting up one year after the finale of the first series, the Maruhage Empire is reformed by former emperor Tsuru Tsurulina III into the Neo-Maruhage Empire, where the Hair Hunts resume and a new generation of powerful Hair Hunt generals are created. Bo-bobo, powering the abilities of his "Fist of the Nosehair" into its "True Theory" form, rejoins Beauty and the Hajike allies to take on the renewed Maruhage threat.
Gyagu Manga Biyori is hyperactive, random, and nonsensical, revolving around various plots and characters throughout the series.
When Kaede, a girl frustrated with her grades like any other teenager, finds a female Ninja attempting to steal her underwear, she didn't expect a friendship to be the result. And as the modern day world of ordinary high schooler Kaede collides with Ninja-in-training Shinobu, she soon comes to discover that the world of modern day Ninjas are filled with parties, picnics, and the training of the elder master Ninja yellow form changing glob: Onsokumaru!