Karel vs Aiden: who would win?

Karel favored — Slight edge (~55%)

Karel · Fire Emblem · Base

Tier

LOW 7-C, up to 7-B

Attack Potency

Small Town Level, up to City Level

Speed

Subsonic, up to Massively Hypersonic

Durability

Small Town Level

Aiden · Minecraft · Base

Tier

7-C

Attack Potency

Town Level

Speed

Average Human, up to Subsonic

Durability

Building Level, up to Town Level

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