Tryndamere vs Zuko: who would win?

Zuko favored — Slight edge (~55%)

Tryndamere · League of Legends · Warring Kingdoms Tryndamere

Tier

LOW 7-C, up to 7-A

Attack Potency

Small Town Level, up to Mountain Level

Speed

Subsonic

Durability

Small Town Level, up to Mountain Level

Zuko · Avatar: The Last Airbender · Season 3

Tier

LOW 7-C, up to 7-C

Attack Potency

Small Town Level, up to Town Level

Speed

Massively Hypersonic+

Durability

Small Town Level, up to Town Level

A heuristic estimate from normalized VS Battles Wiki stats: tier, attack potency, speed and durability.