"Friction" redirects here. For aerial friction, see here.
Because Luigi has a very small amount of traction, he slides very noticeably after finishing a dash.

Traction is a measure of how long it takes for a character to stop moving from a sideways force when grounded. Characters with low traction slide farther than others after walking, dashing, wavedashing, being hit by an attack while grounded, and so on. Traction is mesured in negative units/frame²

Having high traction affords greater ground control over a character, so high traction is generally an advantage. Characters with low traction generally require more precise movement across the ground and cannot punish attacks as effectively out of shield since they will get pushed further away from the opponent. However, there are cases where low traction is useful: low traction is necessary for a long wavedash in Super Smash Bros. Melee and a long dash pivot cancel in Brawl, and there are cases where sliding away from a shielded attack can help escape multiple hits. In Super Smash Bros., characters with lower traction get pushed further away when being attacked when in shield, which makes follow-ups and potential shield breaks harder.

Luigi is well-known for having the least traction of any character in all games except Super Smash Bros. Ultimate; this originates from his low traction in most of the Mario platformers, which balances out his higher jumping.

Traction is also affected by terrain. For instance, nearly all characters have decreased traction on slippery surfaces such as ice. However, the Ice Climbers uniquely have the reverse of this functionality: their normally low traction becomes higher on slippery surfaces.

Traction rankings

Super Smash Bros.

Rank Character Value
1-5   Fox 2
  Link
  Ness
  Pikachu
  Samus
6   Captain Falcon 1.8
7   Donkey Kong 1.7
8   Yoshi 1.6
9   Mario 1.5
10   Kirby 1.4
11   Jigglypuff 1.1
12   Luigi 0.7

Super Smash Bros. Melee

Rank Character Value
1-4   Link 0.1
  Peach
  Pichu
  Zelda
5-6   Jigglypuff 0.09
  Pikachu
7-13   Captain Falcon 0.08
  Donkey Kong
  Falco
  Fox
  Kirby
  Sheik
  Young Link
14   Ganondorf 0.07
15-23   Bowser 0.06
  Dr. Mario
  Mario
  Marth
  Mr. Game & Watch
  Ness
  Roy
  Samus
  Yoshi
24   Mewtwo 0.04
25   Ice Climbers 0.035
26   Luigi 0.025

Super Smash Bros. Brawl

Rank Character Value
1   Lucario 0.0736
2   Jigglypuff 0.0718
3-6   Sonic 0.07
  Wario
  Wolf
  Zero Suit Samus
7-8   Ganondorf 0.068
  Peach
9   Falco 0.065
10   Link 0.064
11-16   Fox 0.06
  Mario
  Mr. Game & Watch
  Olimar
  R.O.B.
  Sheik
17   Pikachu 0.0596
18   Samus 0.0585
19   Bowser 0.0577
20-22   Charizard 0.055
  Marth
  Meta Knight
23   Toon Link 0.0547
24   Ness 0.0546
25   Snake 0.0542
26   Zelda 0.054
27   Ivysaur 0.0532
28   Donkey Kong 0.0529
29   Pit 0.0505
30   Captain Falcon 0.05
31   Kirby 0.0493
32-33   Diddy Kong 0.0484
  King Dedede
34   Lucas 0.045
35   Ike 0.044
36   Yoshi 0.0426
37   Squirtle 0.042
38   Ice Climbers 0.035
39   Luigi 0.022

Super Smash Bros. 4

Rank Character Value
1   Lucario 0.0736
2   Jigglypuff 0.0718
3-5   Little Mac 0.07
  Wario 0.07
  Zero Suit Samus
6-9   Ganondorf 0.068
  Palutena
  Peach
  Rosalina & Luma
N/A Giga Bowser 0.067
10-11   Corrin 0.065
  Falco
12-13   Link 0.064
  Mii Swordfighter 0.064
14-24   Fox 0.06
  Mega Man
  Mr. Game & Watch
  Olimar
  R.O.B.
  Roy
  Ryu
  Sheik
  Sonic
  Villager
  Wii Fit Trainer
N/A Wario-Man 0.06
25   Pikachu 0.0596
26   Samus 0.0585
27   Bowser 0.0577
28-33   Cloud 0.055
  Bayonetta 0.055
  Lucina
  Marth
  Meta Knight
  Robin
34   Toon Link 0.0547
35   Ness 0.0546
36   Zelda 0.054
37   Donkey Kong 0.0529
38-39   Dark Pit 0.0505
  Pit
40   Captain Falcon 0.05
41   Kirby 0.0493
42-43   Diddy Kong 0.0484
  King Dedede
44-52   Bowser Jr. 0.045
  Dr. Mario
  Duck Hunt
  Greninja
  Lucas
  Mario
  Pac-Man
  Mii Brawler 0.045
  Mii Gunner
53-54   Ike 0.044
  Shulk
55   Yoshi 0.0426
56-57   Charizard 0.04
  Mewtwo
58   Luigi 0.024

Super Smash Bros. Ultimate

In Ultimate, traction has been significantly increased across the cast, with even the lowest traction values being higher than the highest traction values in SSB4. This allows for every character to slow down faster on the ground after moving horizontally, and most notably benefits characters with low traction (such as Luigi and Charizard), as shielded attacks now push them back a much shorter distance, and it is therefore easier for them to punish out of shield. However, the increased traction also results in slide smashes covering less distance than in SSB4 as well. Unlike in previous games, Luigi no longer has the least traction, nor is he even in the bottom twenty; the characters with the least traction are now the Mii Gunner and Banjo & Kazooie.

Rank Character Value
1   Sonic 0.138
2-3   Pit 0.135
  Dark Pit
4   Pikachu 0.132
5-8   Ness 0.131
  Mr. Game & Watch
  Villager
  Isabelle
9-10   Joker 0.13
  Min Min
11   Corrin 0.129
12   Wii Fit Trainer 0.128
13   Falco 0.127
14-15   Ganondorf 0.125
  Byleth
16   Donkey Kong 0.123
17-18   Ivysaur 0.121
  Mythra
19   Mii Brawler 0.12
20-28   Kirby 0.116
  Zelda
  Mewtwo
  Zero Suit Samus
  Snake
  Lucas
  Lucario
  Little Mac
  Pac-Man
29-30   Fox 0.115
  Kazuya
31-33   Marth 0.114
  Lucina
  Incineroar
34   Link 0.113
35   Ike 0.112
36-38   Peach 0.111
  Daisy
  Terry
39-47   Pichu 0.11
  Charizard
  Wolf
  Mii Swordfighter
  Ryu
  Ken
  Bayonetta
  Hero
  Sephiroth 0.11
48-49   Roy 0.107
  Chrom
50-54   Sheik 0.106
  Dr. Mario
  Wario
  Palutena
  Cloud 0.106
55-59   Captain Falcon 0.105
  Young Link
  R.O.B.
  Robin
  King K. Rool
60   Bowser 0.104
61-62   Mario 0.102
  Inkling
63   Rosalina & Luma 0.099
64   Meta Knight 0.097
65   Luigi 0.096
66-67   Yoshi 0.095
  Steve
68-69   Mega Man 0.094
  Shulk
70-71   Diddy Kong 0.093
  Olimar
72   Duck Hunt 0.09
73-74   Squirtle 0.088
  Piranha Plant
75-76   Jigglypuff 0.087
  Greninja
77-78   Toon Link 0.086
  Sora
79-82   King Dedede 0.085
  Bowser Jr.
  Simon
  Richter
83-84   Samus 0.082
  Dark Samus
85-86   Ridley 0.08
  Pyra
87   Ice Climbers 0.077
88-89   Mii Gunner 0.076
  Banjo & Kazooie