Billy vs Champion: who would win?

Billy favored — Favored (~65%)

Billy · Adventure Time · Prime

Tier

5-A

Attack Potency

Large Planet Level

Speed

Ftl+

Durability

Large Planet Level

Champion · Terraria · Post-Lunatic Cultist

Tier

HIGH 5-A

Attack Potency

Brown Dwarf Level

Speed

Subsonic+, up to Hypersonic+

Durability

City Block Level+

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