Leo Kaiser vs Bookworm: who would win?

Leo Kaiser favored — Slight edge (~55%)

Leo Kaiser · Saint Seiya · Base

Tier

3-C, up to LOW 2-C

Attack Potency

Galaxy Level, up to Universe Level+

Speed

Speed Of Light

Durability

Unknown

Bookworm · My Little Pony · Inside the Story World

Tier

4-A

Attack Potency

Multi-Solar System Level

Speed

Infinite

Durability

Multi-Solar System Level

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