Since the game is non-canon, they have to establish their personalities in Smash. Also, none of the original series except perhaps the two third parties had consistent personalities. Maybe, just maybe, StarFox and Donkey Kong. The rest? Widely inconsistent, if they have any personality at all.(Link has one? Nah, he just has emotions)
[COLLAPSE="Here are my thoughts on every character in the SSE:"]Mario is the atypical hero. Sakurai did right by him.
Luigi was made too cowardly, but not funny enough. He also didn't act consistently.
Bowser is menacing. That was accurate. However, I didn't like him being a slave.
Peach... kinda disappeared into the shadows too often. But her personality was constant, and well-done.
Donkey Kong: Fitting, but fades into the background after a while.
Diddy Kong: Acts a lot like a monkey, but rarely like the cool dude he was back in the Super Nintendo days. He wasn't good. He wasn't terrible. He was okay.
Link: Goes off on a random adventure for no reason, and seems to have no clear set goal. Still, his personality works.
Zelda (and Sheik): Acts too much like Peach. Also, Sheik's appearance was random, and probably out of place.
Ganondorf: Fits somewhat like his character, except he was afraid to fight.
Toon Link: Unused, which was garbage.
Samus/ZSS: The motivation was there, but the character... kinda disappeared. However, I loved the Samus-Ridley rivalry. I think it was the best rivalry in the story, actually.
Yoshi: Had no purpose at all.
Kirby: The end of his story seemed like a lame way to use his powers. Still, he seemed accurate.
Meta Knight: Accurate, but I would have liked to see him beforehand. I mean, he was the plot.
King Dedede: Sakurai made him, voice him, and wrote the story with him in mind. So he was accurate.
Fox: After the first two scenes, he was just another bland character.
Falco: Awesome intro. After that, he sucked, did nothing, and wasn't Falco.
Wolf: Lame appearance afterwards.
Pikachu: Kinda just a plot device for Samus' story line.
Jigglypuff: Didn't matter in the story.
Lucario: Did some cool stuff initially, but disappeared soon after. So, he was okay.
The Pokémon Trainer: The only thing I remember him doing was catching the Pokémon. And even for that, Ivysaur felt like a poor add-on. Charizard felt properly placed.
Captain Falcon: Did one Falcon Punch, and the did nothing awesome ever again... except for calling his Falcon Flyer.
Ness: Cool intro. That's about it.
Lucas: Was emo the whole time. I don't mind him emo, but tone it down man.
the Ice Climbers: Were a plot device.
Mr. Game and Watch: Funny and well-used for their role.
Marth: Cool intro. After that, he did nothing.
Ike: Did nothing. Awfully used.
Pit: Cool introduction, and stayed relevant for a while. However, like most characters, he eventually became a background character for the latter half of the story.
Wario: Funny throughout, but I don't seem to understand his goals entirely. I hate to nitpick, but he was way too based off Wario Ware for my likings.
Olimar: Did nothing ever. Poorly used, aside from the first scene.
R.O.B.: I hated him being the Ancient Minister. After that, he really was just... "there" despite being one of the 2 main playable characters (the other being Meta Knight).
Snake: Had two funny scenes involving hiding in a box. Seriously, aside from hiding in a box, he did nothing in the story.
Sonic: Was a poorly done late add-on to the story. Seriously, that was a lame way to "weaken" Tabuu. Terrible story-telling methods by Sakurai.[/COLLAPSE]