Kyuss vs Usopp: who would win?

Kyuss favored — Slight edge (~55%)

Kyuss · Dungeons & Dragons · Base

Tier

LOW 6-B, up to HIGH 6-B

Attack Potency

Small Country Level, up to Large Country Level

Speed

Ftl

Durability

Small Country Level, up to Large Country Level

Usopp · One Piece · Onigashima Raid

Tier

6-B

Attack Potency

Country Level

Speed

Relativistic

Durability

Multi-City Block Level, up to Country Level

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