Martin Mertens vs Eight: who would win?

Martin Mertens favored — Slight edge (~55%)

Martin Mertens · Adventure Time · Post-Catalyst Comet

Tier

LOW 2-C

Attack Potency

Universe Level+

Speed

Omnipresent

Durability

Universe Level+

Eight · Dragon Quest · End of Game/Postgame

Tier

LOW 2-C, up to 2-C

Attack Potency

Universe Level+, up to Low Multiverse Level

Speed

Immeasurable

Durability

Universe Level+, up to Low Multiverse Level

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