Leviathan (RWBY) vs Kuki Urie: who would win?

Leviathan (RWBY) favored — Slight edge (~55%)

Leviathan (RWBY) · RWBY · Base

Tier
LOW 7-C
Attack Potency
Small Town Level
Speed
Relativistic
Durability
Small Town Level

Kuki Urie · Tokyo Ghoul · Base

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

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