"John Doe" vs Demogorgon: who would win?

Demogorgon favored — Slight edge (~55%)

"John Doe" · Star Trek · Base

Tier

LOW 2-C

Attack Potency

Universe Level+

Speed

Infinite

Durability

Universe Level+

Demogorgon · Dungeons & Dragons · In the Abyss

Tier

2-C

Attack Potency

Low Multiverse Level

Speed

Infinite

Durability

Multi-Continent Level, up to Low Multiverse Level

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