Diavolo vs Ishida Kotori: who would win?

Diavolo favored — Slight edge (~55%)

Diavolo · JoJo's Bizarre Adventure · Doppio

Tier

10-A, up to HIGH 8-C

Attack Potency

Athlete Level, up to Large Building Level

Speed

Massively Ftl

Durability

Athlete Level, up to Large Building Level

Ishida Kotori · Crows x Worst · Base

Tier

10-A, up to 9-B

Attack Potency

Athlete Level, up to Wall Level

Speed

Athletic Human, up to Subsonic

Durability

Athlete Level, up to Wall Level

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