- College and possible mature themes. (not a must, but it would be interesting - they could get away with so much more depicting 18-25 year olds instead of 12-18 y/os)
- Rebrand the franchise to something more reflecting the nature of the game. You are not really a bully - you beat up bullies. School watchdog groups tried to kill the original over a silly name.
- Drivable cars. ("cars are for seniors, Jimmy")
- Joinable cliques. Have an alternate storyline for each one. Include some type of minigame to improve your status with each. E.g. if you are a jock, have a sports mini-game, if you are a nerd, have a brain puzzle game, etc. Kind of like school classes.
- Going steady / girlfriends. Getting kisses for health restoration is nice, but can we take it further?
- If college, have the ending sequence be like Animal House and say what various characters ended up doing. The protagonist's future will be determined by your course of play and decisions made.
- For high school, do something similar. Also include college choices. Say if you suck at school you go to the local community college and flunk out. If you get all A+'s go to Ivy League. This should be included in alternate endings.
- A rival school. This would add so many more story options than "crazy kid wants to take over school by conning all the clique leaders".
- RPG elements and a changing physique like GTA: San Andreas
- Do it like GTA 5 where you can pick characters. They could work this in to clique selection. Have around 5 different characters from which to to choose. Characters would be typical to their clique, but have something about them that makes them stand out.
- More jobs. Add to paper route and lawn mowing. You should be able to apply for a prefect, work at a shop and do deliveries, or work as a waiter. Anyway to make some coin.
- Have the game take place at a public school. The private boarding school thing was fun for the first game, but I think they should change it up some. That way you can wear just whatever around campus and not get in trouble. This isn't really a must either. Just an idea.
- SAT/ACT. Have a final aptitude test in preparation for college.
I can't think of much else. The original had so many elements and layers that it's hard to improve. I just want another installment of the series. Rockstar seems to neglect this franchise. They are more into M-rated controversial games than T-rated fun school romps.