Kaine Parker vs Original Demon: who would win?

Original Demon favored — Slight edge (~55%)

Kaine Parker · Marvel · The Other

Tier

4-B

Attack Potency

Solar System Level

Speed

Hypersonic, up to Massively Ftl+

Durability

Solar System Level

Original Demon · Nanatsu no Taizai · Base

Tier

4-B

Attack Potency

Solar System Level

Speed

Ftl

Durability

Solar System Level

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