Kamen Rider Chaser vs Riku: who would win?

Kamen Rider Chaser favored — Slight edge (~55%)

Kamen Rider Chaser · Kamen Rider · Kamen Rider Chaser

Tier

1-C

Attack Potency

Complex Multiverse Level

Speed

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.