Mina Ashiro vs Serapis: who would win?

Serapis favored — Slight edge (~55%)

Mina Ashiro · Kaiju No. 8 · Base

Tier

HIGH 6-B, up to HIGH 6-A

Attack Potency

Large Country Level, up to Multi-Continent Level

Speed

High Hypersonic, up to Ftl

Durability

Mountain Level+, up to Large Country Level

Serapis · Percy Jackson · Supreme god

Tier

HIGH 6-B

Attack Potency

Large Country Level

Speed

Unknown

Durability

Large Country Level

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