Kamen Rider Super-1 vs Alfonse: who would win?

Kamen Rider Super-1 favored — Slight edge (~55%)

Kamen Rider Super-1 · Kamen Rider · Main Series

Tier

1-C

Attack Potency

Complex Multiversal

Speed

High Hypersonic, up to Ftl+

Durability

Complex Multiversal

Alfonse · Fire Emblem · Book I

Tier

1-C

Attack Potency

Complex Multiverse Level

Speed

Superhuman, up to Massively Hypersonic+

Durability

Complex Multiverse Level

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