Kafka Hibino vs Nut: who would win?

Nut favored — Slight edge (~55%)

Kafka Hibino · Kaiju No. 8 · Full Transformation (Post-Bond)

Tier
6-A, up to HIGH 6-A
Attack Potency
Continent Level, up to Multi-Continent Level
Speed
Ftl
Durability
Continent Level, up to Multi-Continent Level

Nut · Percy Jackson · Base

Tier
6-A, up to HIGH 6-A
Attack Potency
Continent Level, up to Multi-Continent Level
Speed
Nigh-Omnipresent
Durability
Continent Level, up to Multi-Continent Level

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