Sertrous vs Luigi: who would win?

Sertrous favored — Slight edge (~55%)

Sertrous · Dungeons & Dragons · Demon Lord

Tier

LOW 2-C

Attack Potency

Universe Level+

Speed

Infinite

Durability

Universe Level+

Luigi · Super Mario Bros · Dreamy Luigi

Tier

LOW 2-C, up to 2-B

Attack Potency

Universe Level+, up to Multiverse Level

Speed

Massively Ftl+

Durability

Universe Level+, up to Multiverse Level

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