Ekko (Arcane) vs Maiko Plasma: who would win?

Maiko Plasma favored — Slight edge (~55%)

Ekko (Arcane) · Arcane · Season 2

Tier
8-C
Attack Potency
Building Level
Speed
Athletic Human, up to Subsonic
Durability
Building Level

Maiko Plasma · One-Punch Man · Base

Tier
8-C
Attack Potency
Building Level
Speed
Supersonic, up to Massively Hypersonic+
Durability
Unknown

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