Drogon vs Kuroyoru Umidori: who would win?

Drogon favored — Slight edge (~55%)

Drogon · Game of Thrones · Base

Tier

8-B, up to LOW 7-C

Attack Potency

City Block Level+, up to Small Town Level

Speed

Hypersonic

Durability

City Block Level+

Kuroyoru Umidori · Toaru Majutsu no Index · With Extra Arms

Tier

8-A, up to 7-C

Attack Potency

Multi-City Block Level, up to Town Level

Speed

Peak Human, up to Supersonic

Durability

Street Level, up to Town Level

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