Sonic the Hedgehog (Archie Pre-Genesis Wave) vs Shion (Light Novel): who would win?

Shion (Light Novel) favored — Slight edge (~55%)

Sonic the Hedgehog (Archie Pre-Genesis Wave) · Sonic · Super Sonic

Tier

1-C

Attack Potency

Complex Multiverse Level

Speed

Supersonic, up to Immeasurable

Durability

Complex Multiverse Level

Shion (Light Novel) · Tensei Shitara Slime Datta Ken · Battle Spirit Oni

Tier

1-C

Attack Potency

Complex Multiverse Level

Speed

Relativistic+

Durability

Complex Multiverse Level

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