Dr. Ivo Robotnik vs Terry: who would win?

Terry favored — Slight edge (~55%)

Dr. Ivo Robotnik · Sonic · Base

Tier

2-C, up to 1-C

Attack Potency

Low Multiverse Level, up to Complex Multiverse Level

Speed

Infinite, up to Immeasurable

Durability

Low Multiverse Level, up to Complex Multiverse Level

Terry · Dragon Quest · Adult Terry

Tier

2-C

Attack Potency

Low Multiverse Level

Speed

Immeasurable

Durability

Low Multiverse Level

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