ITT: list most unforgiving Characters unlock requirements:

[3D Player 2004]

and hope there are none like that in Smash 4. [Not time consuming ones]

Smash 64:
Captain Falcon: Clear 1-Player Game in 20 minutes or less.
Ness: Clear 1-Player Game on normal difficulty with 3 lives without continuing.

Ironically these 2 were the ones available from the start in Melee.

Melee:
Falco: Completing the 100-Man Melee
Pichu: Completing Event #37--Legendary Pokémon
Mr Game and Watch [only because other characters are hard]: Completing Classic, Adventure, or Target Smash with the other 24 characters

Brawl:
Because of how easy SSE is, you don't really have to do near-impossible tasks to unlock characters. In addition, much of the game has been made substantially easier including Multi-Man Melee, now Multi-Man Brawl and the events due to modifiable difficulty.

 

[Ray Trace]

Captain Falcon is easy if you're playing in Very Easy Difficulty
Ness is easy because computers in Super Smash Bros. are awful

Falco, isn't hard either.
Neither is Pichu. Actually, Event #37 is actually one of my favorite events in the game
Mr. Game & Watch isn't hard.

Mewtwo is the most tedious.

 

[GalacticPetey]

>Go to 100 man melee
>Select DK
>Spam down B

easy Falco.

 

[Ray Trace]

Even without the DK technique it's still easy to beat

It's not like 15 minute Melee or anything

 

[3D Player 2004]

>Go to 100 man melee
>Select DK
>Spam down B
>Get hit by an unlucky Bob-omb
no Falco.

fixed

 

[GalacticPetey]

>Learn to move around and avoid items
>Obtain falco

 

[Magikrazy]

Since when is Pichu unlocked by clearing Legendary Pokémon?

I always did 200 battles to unlock Pichu.

 

[3D Player 2004]

Spoiler: sometimes it is unavoidable

Spoiler: and it isn't like he is a terrible Smash Bros player

 

[Vommack]

....I'm sorry, was there supposed to be something in those spoilers?

 

[3D Player 2004]

....I'm sorry, was there supposed to be something in those spoilers?

yes, I made an error and was in a process of fixing it.

 

[GalacticPetey]

Since when is Pichu unlocked by clearing Legendary Pokémon?

I always did 200 battles to unlock Pichu.

I did this as well.

To be honest, I did this for Mewtwo as well.

 

[Ray Trace]

>Go to 100 man melee
>Select DK
>Spam down B
>Get hit by an unlucky Bob-omb
no Falco.

fixed

Because that happens every time you play 100 man melee, right?

 

[Magikrazy]

Since when is Pichu unlocked by clearing Legendary Pokémon?

I always did 200 battles to unlock Pichu.

I did this as well.

To be honest, I did this for Mewtwo as well.

For Mewtwo, I left my GCN on overnight during a battle.

 

[Lee Chaolan]

100 Man fight is easy with Bowser and Meta Knights Smash Moves.

 

[Lumastar]

Captain Falcon is easy if you're playing in Very Easy Difficulty
Ness is easy because computers in Super Smash Bros. are awful

Falco, isn't hard either.
Neither is Pichu. Actually, Event #37 is actually one of my favorite events in the game.
Mr. Game & Watch isn't hard.

Mewtwo is the most tedious.

This. Unlocking Mewtwo is so tedious. You can leave your Gamecube on all night or play 700 matches, but it's still ridiculous. Mewtwo is easily the most unforgiving character to unlock.

 

[Baby Mario Bloops]

Captain Falcon is easy if you're playing in Very Easy Difficulty
Ness is easy because computers in Super Smash Bros. are awful

Falco, isn't hard either.
Neither is Pichu. Actually, Event #37 is actually one of my favorite events in the game.
Mr. Game & Watch isn't hard.

Mewtwo is the most tedious.

This. Unlocking Mewtwo is so tedious. You can leave your Gamecube on all night or play 700 matches, but it's still ridiculous. Mewtwo is easily the most unforgiving character to unlock.

Well, Mewtwo would have been worth it had he not been such a bad player to play as.

 

[Lumastar]

Captain Falcon is easy if you're playing in Very Easy Difficulty
Ness is easy because computers in Super Smash Bros. are awful

Falco, isn't hard either.
Neither is Pichu. Actually, Event #37 is actually one of my favorite events in the game.
Mr. Game & Watch isn't hard.

Mewtwo is the most tedious.

This. Unlocking Mewtwo is so tedious. You can leave your Gamecube on all night or play 700 matches, but it's still ridiculous. Mewtwo is easily the most unforgiving character to unlock.

Well, Mewtwo would have been worth it had he not been such a bad player to play as.

I love playing as Mewtwo. It still doesn't excuse him for being so hard to unlock, though.

 

[Cirdec]

I don"t know if all the time played count if you stop an endless time match. If that's the case then it's easy to unlock Mewtwo, set two human players, set an endless time match, let the gamecube turned on for 20 hours and then cancel the match.

 

[Magikrazy]

That won't work.

1 stock, 2 human players.

Leave on for 20 hours.

Kill one of the guys.

 

[3D Player 2004]

That won't work.

1 stock, 2 human players.

Leave on for 20 hours.

Kill one of the guys.

Good thing this isn't an XBox360 game or we'd have the Red Rings of Death kick in.

 

[Ray Trace]

That won't work.

1 stock, 2 human players.

Leave on for 20 hours.

Kill one of the guys.

4 human players makes the time considerably shorter

 

[3D Player 2004]

That won't work.

1 stock, 2 human players.

Leave on for 20 hours.

Kill one of the guys.

4 human players makes the time considerably shorter

Some people have only 2 GCN Controllers.

 

[Ray Trace]

I'm just saying

 

[Cirdec]

And what to do if you have only one controller?

 

[GalacticPetey]

Do a ton of Vs. Matches like I did.