Onimaru vs Horus: who would win?

Onimaru favored — Slight edge (~55%)

Onimaru · One Piece · Base

Tier

6-A, up to HIGH 6-A

Attack Potency

Continent Level, up to Multi-Continent Level

Speed

Ftl

Durability

Continent Level, up to Multi-Continent Level

Horus · Percy Jackson · Base

Tier

6-A, up to HIGH 6-A

Attack Potency

Continent Level, up to Multi-Continent Level

Speed

High Hypersonic+

Durability

Continent Level, up to Multi-Continent Level

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