Zero (Kirby) vs Charlie (Adventure Time): who would win?

Zero (Kirby) favored — Slight edge (~55%)

Zero (Kirby) · Kirby · Base

Tier
5-A
Attack Potency
Large Planet Level
Speed
Massively Ftl+
Durability
Large Planet Level

Charlie (Adventure Time) · Adventure Time · Base

Tier
5-A
Attack Potency
Large Planet Level
Speed
Sub-Relativistic
Durability
Large Planet Level

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