The Lady of Pain vs The Player (Undertale): who would win?

The Player (Undertale) favored — Slight edge (~55%)

The Lady of Pain · Dungeons & Dragons · Unrestricted

Tier

LOW 1-C, up to HIGH 1-B

Attack Potency

Low Complex Multiverse Level, up to High Hyperverse Level

Speed

Infinite

Durability

Low Complex Multiverse Level, up to High Hyperverse Level

The Player (Undertale) · Undertale · Real self

Tier

LOW 1-C

Attack Potency

Low Complex Multiverse Level

Speed

Immeasurable

Durability

Low Complex Multiverse Level

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