Red Rush (TV Series) vs Isao Shinomiya: who would win?

Red Rush (TV Series) favored — Slight edge (~55%)

Red Rush (TV Series) · Invincible · Base

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

Isao Shinomiya · Kaiju No. 8 · Base

Tier
7-A, up to 6-A
Attack Potency
Mountain Level+, up to Continent Level
Speed
High Hypersonic+, up to Ftl
Durability
Mountain Level+

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