Ayato Kirishima vs Mumbo: who would win?

Ayato Kirishima favored — Favored (~65%)

Ayato Kirishima · Tokyo Ghoul · Base

Tier
8-A, up to LOW 7-C
Attack Potency
Multi-City Block Level+, up to Small Town Level
Speed
Hypersonic+, up to Sub-Relativistic
Durability
Multi-City Block Level+, up to Small Town Level

Mumbo · DC · Base

Tier
LOW 7-C
Attack Potency
Athlete Level, up to Small Town Level
Speed
Relativistic
Durability
Athlete Level, up to Small Town Level

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