Surtr (Fire Emblem) vs Sigma (Archie Comics): who would win?

Sigma (Archie Comics) favored — Slight edge (~55%)

Surtr (Fire Emblem) · Fire Emblem · Book II

Tier

1-C

Attack Potency

Complex Multiverse Level

Speed

Superhuman, up to Massively Hypersonic+

Durability

Complex Multiverse Level

Sigma (Archie Comics) · Mega Man · Sigma-3

Tier

1-C

Attack Potency

Complex Multiverse Level

Speed

Immeasurable

Durability

Complex Multiverse Level

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