Flame Reaver vs Kevin 11,000: who would win?

Flame Reaver favored — Favored (~65%)

Flame Reaver · Honkai: Star Rail · Base

Tier

3-C, up to 2-A

Attack Potency

Galaxy Level, up to Multiverse Level+

Speed

Ftl+, up to Infinite

Durability

Galaxy Level, up to Multiverse Level+

Kevin 11,000 · Ben 10 · Base

Tier

4-A, up to 1-B

Attack Potency

Multi-Solar System Level, up to Hyperverse Level

Speed

Massively Ftl+

Durability

Multi-Solar System Level, up to Hyperverse Level

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