Kamen Rider Ikazuchi vs Minamoto no Raikou (Berserker): who would win?

Minamoto no Raikou (Berserker) favored — Slight edge (~55%)

Kamen Rider Ikazuchi · Kamen Rider · Ark Raising Arc

Tier

LOW 6-B

Attack Potency

Small Country Level

Speed

Subsonic, up to Sub-Relativistic+

Durability

Small Country Level

Minamoto no Raikou (Berserker) · Nasuverse · Rider of Kalasutra Hell

Tier

LOW 6-B

Attack Potency

Small Country Level

Speed

Relativistic+, up to Ftl

Durability

Large Island Level, up to Small Country Level

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