An idea I came up with a while back:
1. A customizable main character
2. 4 Chapters 3 at start and the the last after you beat the first 3 each chapter taking place in a different time line and has it's own story line and characters.
Chapters:
Chapter 1: The Past (The legend of Zelda Kid Kid Icarus: Of Myths and Monsters Fire Emblem) Final Boss: Ashnard.
Chapter 2: The Present (Mario Kirby Mother Donkey Kong Ice Climbers)<Mario RPG centric> Final Boss: Smithy.
Chapter 3: The Future (Metal Gear Star Fox Metroid Pikmin F-Zero) Final Boss: Metal Gear KODOQUE.
Chapter 4: Destinies (Sonic the Hedgehog ROB + 8 of your choice between the other chapters.) Final Boss: ???? <Haven't thougt of one yet
>
4. Mentor system where the main character can learn different Moves and Magic based on the character (Eg. MC can learn sword based moves if he trains under Ike, Marth or Metaknight or magic if he trains under Peach or Zelda and guns under Fox or Samus)
5. A partner Pokemon for each chapter (Past: Pichu Present: Purin Future: Pikachu
Final Chapter: Lucario)<If you beat the game once you can choose which one for each chapter.>
1. A customizable main character
2. 4 Chapters 3 at start and the the last after you beat the first 3 each chapter taking place in a different time line and has it's own story line and characters.
Chapters:
Chapter 1: The Past (The legend of Zelda Kid Kid Icarus: Of Myths and Monsters Fire Emblem) Final Boss: Ashnard.
Chapter 2: The Present (Mario Kirby Mother Donkey Kong Ice Climbers)<Mario RPG centric> Final Boss: Smithy.
Chapter 3: The Future (Metal Gear Star Fox Metroid Pikmin F-Zero) Final Boss: Metal Gear KODOQUE.
Chapter 4: Destinies (Sonic the Hedgehog ROB + 8 of your choice between the other chapters.) Final Boss: ???? <Haven't thougt of one yet

4. Mentor system where the main character can learn different Moves and Magic based on the character (Eg. MC can learn sword based moves if he trains under Ike, Marth or Metaknight or magic if he trains under Peach or Zelda and guns under Fox or Samus)
5. A partner Pokemon for each chapter (Past: Pichu Present: Purin Future: Pikachu
Final Chapter: Lucario)<If you beat the game once you can choose which one for each chapter.>