Kichimura Washuu vs Pernelle Flamel: who would win?

Too close to call

Kichimura Washuu · Tokyo Ghoul · Post Ghoulification

Tier
7-C, up to HIGH 7-C
Attack Potency
Large Town Level, up to Town Level+
Speed
Massively Hypersonic+, up to Sub-Relativistic
Durability
Large Town Level, up to Town Level+

Pernelle Flamel · Puella Magi Verse · Tart Magica

Tier
7-C
Attack Potency
Town Level
Speed
Massively Hypersonic
Durability
Mountain Level, up to Country Level

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