Medaka Kurokami is the perfect honour student. She has exemplary grades, talent at any sport she tries her hand at, comes from a rich family, is exceptionally popular, and has just become the first ever freshman student to be elected School President! During her inauguration speech she proclaims that she will endeavour to help every student with any problem if they simply submit it to the newly instated suggestion box. But with a bare-bones student council consisting of only herself and her unwilling accomplice Zenkichi, people are unsure whether to take her seriously or not. Regardless, Medaka takes each suggestion and gives her all to fulfil any request, be it ridding the kendo hall of delinquents, writing a love letter, or helping a struggling art student find his muse.
If you liked the first 15 chapters of Medaka Box and liked the main duo, you can't go wrong with The Melancholy of Haruhi Suzumiya (the manga might be worth a try too). Although it has an odd highschool club rather than student council, Haruhi has a very similar personality to Medaka and Kyon to Zekichi.