Kamen Rider Dark Kiva vs Zero (Kirby): who would win?

Zero (Kirby) favored — Slight edge (~55%)

Kamen Rider Dark Kiva · Kamen Rider · King/Bat Fangire/Bat Fangire Reborn

Tier

5-A

Attack Potency

Large Planet Level

Speed

Sub-Relativistic

Durability

Large Planet Level

Zero (Kirby) · Kirby · Base

Tier

5-A

Attack Potency

Large Planet Level

Speed

Massively Ftl+

Durability

Large Planet Level

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