Ovelia Atkascha vs Iuno: who would win?

Iuno favored — Slight edge (~55%)

Ovelia Atkascha · Final Fantasy · Base

Tier
5-A
Attack Potency
Large Planet Level
Speed
Sub-Relativistic
Durability
Wall Level, up to Large Planet Level

Iuno · Wuthering Waves · Arrow

Tier
5-A
Attack Potency
Large Planet Level
Speed
Sub-Relativistic+
Durability
City Level

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