Steven Universe vs Ashera: who would win?

Steven Universe favored — Slight edge (~55%)

Steven Universe · Steven Universe · Pink Steven

Tier

HIGH 6-A, up to 5-C

Attack Potency

Multi-Continent Level, up to Moon Level+

Speed

Relativistic

Durability

Multi-Continent Level, up to Moon Level+

Ashera · Fire Emblem · Base

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.