Ayato Kirishima vs Alastor: who would win?

Ayato Kirishima favored — Slight edge (~55%)

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

Alastor · Hazbin Hotel · Base

Tier

LOW 7-C

Attack Potency

Small Town Level

Speed

Subsonic, up to Supersonic+

Durability

Building Level, up to City Block Level+

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