Korra vs Oceanus (Riordan): who would win?

Oceanus (Riordan) favored — Slight edge (~55%)

Korra · Avatar: The Last Airbender · Cosmic Korra

Tier

5-C

Attack Potency

Building Level, up to Moon Level

Speed

Sub-Relativistic

Durability

Moon Level

Oceanus (Riordan) · Percy Jackson · Base

Tier

HIGH 6-A, up to HIGH 4-C

Attack Potency

Multi-Continent Level, up to Large Star Level

Speed

Ftl, up to Massively Ftl+

Durability

Multi-Continent Level, up to Large Star Level

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