Kumara vs Two Face: who would win?

Two Face favored — Slight edge (~55%)

Kumara · Tensei Shitara Slime Datta Ken · Awakened Demon Lord

Tier

6-A, up to 3-A

Attack Potency

Continent Level, up to Universe Level

Speed

Massively Hypersonic, up to Massively Ftl

Durability

Continent Level, up to Universe Level

Two Face · Kirby · Base

Tier

6-A

Attack Potency

Continent Level

Speed

Relativistic+

Durability

Continent Level

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