Luso Signario vs Ouranos (Riordan): who would win?

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

Luso Signario · Fairy Tail · Base

Tier

5-B, up to 5-A

Attack Potency

Planet Level+, up to Large Planet Level

Speed

Speed Of Light

Durability

Unknown

Ouranos (Riordan) · Percy Jackson · True Form

Tier

5-B, up to HIGH 4-C

Attack Potency

Planet Level, up to Large Star Level

Speed

Nigh-Omnipresent

Durability

Planet Level, up to Large Star Level

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