Alfonse vs Ren Amagasaki: who would win?

Ren Amagasaki favored — Slight edge (~55%)

Alfonse · Fire Emblem · Book I

Tier

1-C

Attack Potency

Complex Multiverse Level

Speed

Superhuman, up to Massively Hypersonic+

Durability

Complex Multiverse Level

Ren Amagasaki · Kamen Rider · Lovelica Bugster

Tier

1-C

Attack Potency

Complex Multiverse Level

Speed

Ftl

Durability

Complex Multiverse Level

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