Shadow Moon vs Riku: who would win?

Shadow Moon favored — Slight edge (~55%)

Shadow Moon · Kamen Rider · Kamen Rider World

Tier

1-C

Attack Potency

Complex Multiverse Level

Speed

Ftl, up to Ftl+

Durability

Complex Multiverse Level

Riku · Kingdom Hearts · KH3D

Tier

1-C

Attack Potency

Complex Multiverse Level

Speed

Athletic Human, up to Infinite

Durability

Complex Multiverse Level

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