Being one of Ken Akamatsu's works, Negima features some rather risque content at times and due to this, the series has faced a bit of censorship issues.
The most recognized controversy came from English publisher, Del-Ray. When it was announced Del-Ray would be handling Negima, the publisher was considering making changes that would censor the ecchi content, such as lengthening skirt lengths. There was an outcry among fans, but fortunately, it was decided to not censor the original content. However, despite this, Del-Ray's decisions did end up sparking rage in fans.
Because of the mass fan service in the manga, Del-Ray decided instead of censoring, they would shrink-wrap the volumes before putting them on the market. Readers were not happy with this either, as many collector's pointed out the wrap warped the manga. Del-Ray later discontinued the process.