1.Portals
2.Puzzles
3.Side tasks/missions
4.Collectables
5.Unlockables (images, video, power ups hidden bonus areas)
6.Old characters (Bentley, Elora, Hunter, Zoe, Agent9, Sheila, Srgnt. Byrd, The Professor)
7.New characters (Cynder, Ignitus, Volteer, Cyril, Terrador, Manweersmalls, Atlowa)
8.Comedy! No more dark storyline!
9.Old character personalities (Hunter must be easily frightened and funny/goofy, Spyro must be spunky; no more sad uncertainty ALMOST ALL CHARACTERS MUST BE AS THEY WERE IN THE INSOMNIAC ERA!)
10.Make Sparx funny like he was In ANB and TEN.
11.Revamp Cynder's personality (more spunky like old Spyro, smart aleky, tough, dark but not evil)
12.Return Cyril and Volteer to the way they were in ANB (Cyril: Snooty/ haughty/contemptive(sp?); Volteer: Hyper/wide vocabulary/talkative)
13.HUGE levels to explore (climable serfaces, swimming, underwater areas, Super high flying but with time limits, hidden areas, secret paths, hidden items, etc)
14.Beautiful and creative/imaginative worlds.
There! It's a mouthful, but it would be a rockn' game!
I want to add more stuff, but most of it came from other users in the thread.
All flight levels, unlockable characters, underwater levels, unlockable games, levels where you can only be one character, SLIDES! WEEE!, Airial worlds like Cloudy Domain, Power up portals like in Spyro 2, and an RPG-ish game where you have to learn indevidual ablilities as you want to and where you level up, and you could learn magicand mental abilities like in Shadow Legacy. Also, the guardians from Shadow Legacy and A Hero's Tail should return, along with the LOS Guardians.
It would be so cool if it were like Fable where you could be good or evil! Also like Fable, there should be optional courting; there would be whole be whole towns of dragons, all of whom you could interact with. You could speak to females using variety of expressions programmed into the game and get them to fall in love with you. You could also make friends who would come fight with you.
Gems should be currency and your powers should be limitless.There would be vendors who would sell you some armor (but rarer, more powerful peices needed to be won/found), upgrades, health, and armor repairs. Money bags should return but he would only be in the main city; the rest of the vendors would be bears like him.
STEWART COPELAND MUST DO THE SOUNDTRACK! EL would d the graphics coz DotD was GORGEOUS!