Kaiju No. 13 vs Nagisa Momoe.: who would win?

Nagisa Momoe. favored — Slight edge (~55%)

Kaiju No. 13 · Kaiju No. 8 · Base

Tier
7-A
Attack Potency
Mountain Level+
Speed
High Hypersonic, up to High Hypersonic+
Durability
Mountain Level+, up to Island Level

Nagisa Momoe. · Puella Magi Verse · Law of Cycles Assistant

Tier
7-A
Attack Potency
Mountain Level+
Speed
Massively Hypersonic+
Durability
Mountain Level+

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