A few ideas I've been saving back
Final Fantasy Crystal Chronicles: Echoes of time with an original story and new dungeons?
The game was pretty decent with good customization options but way too short, especially with a high level character carried over several times.
Harvest Moon: Friends of the Apocalypse (Friends of Mineral town hack)
A post apocalyptic sequel to Friends of mineral town,
Takes place after the death/murder of the Harvest Goddess
Gameplay changes: combat, town building, farm defense.
Metroid: X Evolution
Sequel to Fusion, Main character is an escaped SA-X.
Gameplay changes: Copy ability, faster & smoother gameplay, more survival horror?, maybe rpg elements/towns/settlements/branching story?