Kuroyoru Umidori vs Mei Hatsume: who would win?

Too close to call

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

Mei Hatsume · My Hero Academia · Base

Tier

8-A

Attack Potency

Multi-City Block Level

Speed

Unknown

Durability

Wall Level, up to Multi-City Block Level

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