Classic Playable Characters
Depending on which paths you take, you can unlock some classic characters to use during battle. Also, you will unlock their profile.

UnlockableHow to Unlock
Bill Grey-Take the path to start the mission "Falco to the Fore!"
James McCloud-Take the path to start the mission "Dash makes a choice" James will appear near the end of the battle.
Katt Monroe-Take the path to start the mission "Pigmas's Revenge"
Peppy Hare-Take the path to start the mission "Andross's Legacy

CoThe Key of Destiny
Complete the game once to unlock the key of detsiny. This grants you access to the many branching paths and endings.
Unlockable-How to Unlock
The Key of Destiny-Beat the game once

Hard Mode
After beating the game the first time, the game shifts to hard mode on your next playthroughs.
Unlockable-How to Unlock
Hard Mode-Beat the game

Unlockables
Alternate Title Screen Music
Complete the game and unlock each ending to hear the StarFox 64 music on the title screen.