Mermaid Thetis vs Toya: who would win?

Toya favored — Slight edge (~55%)

Mermaid Thetis · Saint Seiya · Base

Tier

HIGH 6-A

Attack Potency

Multi-Continent Level

Speed

Supersonic, up to High Hypersonic

Durability

Multi-Continent Level

Toya · Yu Yu Hakusho · Three Kings Arc

Tier

HIGH 6-A

Attack Potency

Multi-Continent Level

Speed

Massively Hypersonic

Durability

Multi-Continent Level

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