In Super Smash Bros. Ultimate , the most commonly cited answer is Snake for having the most winning matchups in a matchup-based tier discussion, with one community post noting Snake at 82 winning matchups out of 86 and saying Steve was close but had fewer.

Why this answer

That claim comes from a matchup-based tier list discussion, which is a community interpretation rather than an official game statistic.

In Smash, “most winning matchups” usually means a character has the advantage against the largest number of other characters in the cast.

Caveat

This can vary by game version, ruleset, and whose matchup chart you trust, so different players may name different characters.

If you meant a specific Smash game like Melee, Smash 4, or Ultimate, the answer can change.