Sentai School. Awesome series.
Sentai school is mostly unknown except in france, but that doesn't prevent it from being a good manfra ( French Manga ).
Humor is childish but there are so much shout outs, expies, hints and parodies that you will laugh. The only drawback is that most of the manga/comic characters are either named based on their dub names or french names.
Why is it awesome ?
1 ) You can see shout outs to Saint Seiya, Space Adventure Cobra, Captain Tsubasa, Naruto, One Piece, GTO, Love Hina, Ranma, HNK and so on
2 ) Most of the old anime classic tropes are in it
3 ) There is character devlopement
4 ) Teachers are old anime heroes, most of the time.
If you have the opportunity to read it, give it a try.