The Original Starwalker vs Millennian Io: who would win?

Millennian Io favored — Slight edge (~55%)

The Original Starwalker · Undertale · Base

Tier

8-A

Attack Potency

Multi-City Block Level

Speed

Average Human, up to Ftl

Durability

Multi-City Block Level

Millennian Io · Godzilla · Unstable State/Orga

Tier

8-A

Attack Potency

Multi-City Block Level

Speed

Subsonic, up to Supersonic+

Durability

Multi-City Block Level

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