In both manga, the main characters are trying to make the school a better place. In Oresama Teacher they are trying to control the delinquents so more kids will go to the school and in Pika Ichi the main characters are trying to rid the school of bullying. Both main females don't cry easily and both have fights.
Pika Ichi and Oresama Teacher both have strong protagonists who have a strong sense of justice and want to help others at their school. They both even have that one dense student-become-sidekick that doesn't seem to get it most of the time.
Pika*Ichi has good-guy delinquents as the main characters, and they go up against the "student council" while trying to make their school better. It's very funny and every character adds something to the mix. It sounds similar to Oresama Teacher, but the comedy and characters are very different so you won't feel as though you're reading a knock-off. Pika*Ichi is a little more shoujo, while I'd consider Oresama Teacher to be a little more shounen. Both are fantastic and hilarious.
An elite school, twisted into a nightmare for the students, by the students. A group decides to put an end to the madness, and restore peace. There is romance but the school, it's students, and the mob mentality are the main focuses.
these are similar because they both involve the main character being a target of the whole school - students in both stories do this because they are following a tradition. they both involve the 'boss' of the school to confront the main character and the protagonist tries to understand them. happy reading :)
both have female characters who appear 'ugly', unfashionable at the beginning of the story. main difference of these 2 is that Pika☆Ichi involves the main male character coincidentally in the same position as the main female character. both main characters change their looks because of an unforgiven act on them had happened. happy reading :)