64
Melee
Brawl
4
Ultimate
100

This character is the first character you face in 1P mode.

Who is Link?

100

This character is transformation of an already existing character. This character would later become playable by themself in Smash 4.

Who is Sheik?

100

This character was initially begged to be put in melee, but was unable to due to melee being too far into development. This marks the first third party character.

Who is Snake?

100

A clone... literally!

Who is Dark Pit?

100

A legendary vampire hunter, that was was completely unexpected and was not leaked.

Who is Richter?

200

This character is the final boss of 1P mode.

Who is Master Hand?

200

This character is a character who fights with a sword, that would not appear again until Smash 4. 

Who is Roy?

200

In the story mode, this newcomer is the second character to physically activate the trophy of a defeated character (Mario).

Who is Pit?

200

The final Fire Emblem character to be added to this game.

Who is Corrin/Kamui?

200

The return of a character who has not been present since Smash Melee, who was in turn replaced with another form of themself in Brawl and 4.

Who is Young Link?

300

The second last stage of 1P mode, which pits you off against a team. What is this teams name?

Who is the Polygon Team?

300

This character that is non-playable normally, becomes playable with the use of a glitch in the game.

Who is Master Hand?

300

This character was hidden as the Ancient Minister for a majority of the story mode.

Who is R.O.B?

300

A character that everyone wanted, but no one actually expected to get due to not having a mainline game on a Nintendo Console.

Who is Cloud?

300

This playable character appeared as a boss battle in Brawl.

Who is Ridley?

400

The representative Kirby map in this game.

What is Dream Land?

400

The only game mode in this game that has to be unlocked.

What is All Star Mode?

400

As of this game, this particular character was the only character to have only appeared in Japan.

Who is Lucas?

400

These two franchise was completely cut in Smash 4, as all characters representing the franchise were removed from the transition from Brawl to 4.

What is Metal Gear Solid and Ice Climbers?

400

The first revealed echo fighter newcomer.

Who is Daisy?

500

Aside from Samus and Pikachu, Smash 64 is the first time this character was rendered in 3D.

Who is Ness?

500

(Excluding Smash Ultimate) Due to this character, this game was marked as the only time in which Jigglypuff was not the lightest character in the game.

Who is Pichu?

500

The only Mario Universe character to have ever been cut from a game. (In this case, this character was cut from melee, and not back in brawl.

Who is Dr Mario?

500

These three newcomers, mark the first time these characters have been playable in any game. 

Who are Palutena, Wii Fit Trainer and Duck Hunt?

500

The first character to appear as a boss and assist trophy in Smash Bros history.

Who is Rathalos?